/*----------------------------------------------------------------------------/
/  FatFs - Generic FAT file system module  R0.12c                             /
/-----------------------------------------------------------------------------/
/
/ Copyright (C) 2017, ChaN, all right reserved.
/
/ FatFs module is an open source software. Redistribution and use of FatFs in
/ source and binary forms, with or without modification, are permitted provided
/ that the following condition is met:
/
/ 1. Redistributions of source code must retain the above copyright notice,
/    this condition and the following disclaimer.
/
/ This software is provided by the copyright holder and contributors "AS IS"
/ and any warranties related to this software are DISCLAIMED.
/ The copyright owner or contributors be NOT LIABLE for any damages caused
/ by use of this software.
/----------------------------------------------------------------------------*/


#include "ff.h"            /* Declarations of FatFs API */
#include "diskio.h"        /* Declarations of device I/O functions */


/*--------------------------------------------------------------------------

   Module Private Definitions

---------------------------------------------------------------------------*/

#if _FATFS != 68300    /* Revision ID */
#error Wrong include file (ff.h).
#endif


/* DBCS code ranges and SBCS upper conversion tables */

#if _CODE_PAGE == 932    /* Japanese Shift-JIS */
                                                                                                                        #define _DF1S	0x81	/* DBC 1st byte range 1 start */
#define _DF1E	0x9F	/* DBC 1st byte range 1 end */
#define _DF2S	0xE0	/* DBC 1st byte range 2 start */
#define _DF2E	0xFC	/* DBC 1st byte range 2 end */
#define _DS1S	0x40	/* DBC 2nd byte range 1 start */
#define _DS1E	0x7E	/* DBC 2nd byte range 1 end */
#define _DS2S	0x80	/* DBC 2nd byte range 2 start */
#define _DS2E	0xFC	/* DBC 2nd byte range 2 end */

#elif _CODE_PAGE == 936    /* Simplified Chinese GBK */
                                                                                                                        #define _DF1S	0x81
#define _DF1E	0xFE
#define _DS1S	0x40
#define _DS1E	0x7E
#define _DS2S	0x80
#define _DS2E	0xFE

#elif _CODE_PAGE == 949    /* Korean */
                                                                                                                        #define _DF1S	0x81
#define _DF1E	0xFE
#define _DS1S	0x41
#define _DS1E	0x5A
#define _DS2S	0x61
#define _DS2E	0x7A
#define _DS3S	0x81
#define _DS3E	0xFE

#elif _CODE_PAGE == 950    /* Traditional Chinese Big5 */
                                                                                                                        #define _DF1S	0x81
#define _DF1E	0xFE
#define _DS1S	0x40
#define _DS1E	0x7E
#define _DS2S	0xA1
#define _DS2E	0xFE

#elif _CODE_PAGE == 437    /* U.S. */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
				0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720    /* Arabic */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737    /* Greek */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
				0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 771    /* KBL */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 775    /* Baltic */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
				0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
				0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850    /* Latin 1 */
#define _DF1S    0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
                0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
                0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
                0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
                0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
                0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852    /* Latin 2 */
                                                                                                                        #define _DF1S	0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
				0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
				0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855	/* Cyrillic */
#define _DF1S	0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
				0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
				0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
				0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
				0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857	/* Turkish */
#define _DF1S	0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
				0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
				0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 860	/* Portuguese */
#define _DF1S	0
#define _EXCVT {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
				0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 861	/* Icelandic */
#define _DF1S	0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
				0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
				0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862	/* Hebrew */
#define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 863	/* Canadian-French */
#define _DF1S	0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
				0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
				0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 864	/* Arabic */
#define _DF1S	0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
				0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 865	/* Nordic */
#define _DF1S	0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
				0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
				0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866	/* Russian */
#define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
				0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 869	/* Greek 2 */
#define _DF1S	0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
				0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
				0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
				0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
				0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
				0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
				0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
				0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}

#elif _CODE_PAGE == 1	/* ASCII (for only non-LFN cfg) */
#if _USE_LFN != 0
#error Cannot enable LFN without valid code page.
#endif
#define _DF1S	0

#else
#error Unknown code page

#endif


/* Character code support macros */
#define IsUpper(c)    (((c)>='A')&&((c)<='Z'))
#define IsLower(c)    (((c)>='a')&&((c)<='z'))
#define IsDigit(c)    (((c)>='0')&&((c)<='9'))

#if _DF1S != 0    /* Code page is DBCS */

                                                                                                                        #ifdef _DF2S	/* Two 1st byte areas */
#define IsDBCS1(c)	(((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else			/* One 1st byte area */
#define IsDBCS1(c)	((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S	/* Three 2nd byte areas */
#define IsDBCS2(c)	(((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else			/* Two 2nd byte areas */
#define IsDBCS2(c)	(((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else			/* Code page is SBCS */

#define IsDBCS1(c)    0
#define IsDBCS2(c)    0

#endif /* _DF1S */


/* Additional file attribute bits for internal use */
#define    AM_VOL        0x08    /* Volume label */
#define AM_LFN        0x0F    /* LFN entry */
#define AM_MASK        0x3F    /* Mask of defined bits */


/* Additional file access control and file status flags for internal use */
#define FA_SEEKEND    0x20    /* Seek to end of the file on file open */
#define FA_MODIFIED    0x40    /* File has been modified */
#define FA_DIRTY    0x80    /* FIL.buf[] needs to be written-back */


/* Name status flags in fn[] */
#define NSFLAG        11        /* Index of the name status byte */
#define NS_LOSS        0x01    /* Out of 8.3 format */
#define NS_LFN        0x02    /* Force to create LFN entry */
#define NS_LAST        0x04    /* Last segment */
#define NS_BODY        0x08    /* Lower case flag (body) */
#define NS_EXT        0x10    /* Lower case flag (ext) */
#define NS_DOT        0x20    /* Dot entry */
#define NS_NOLFN    0x40    /* Do not find LFN */
#define NS_NONAME    0x80    /* Not followed */


/* Limits and boundaries */
#define MAX_DIR        0x200000        /* Max size of FAT directory */
#define MAX_DIR_EX    0x10000000        /* Max size of exFAT directory */
#define MAX_FAT12    0xFF5            /* Max FAT12 clusters (differs from specs, but correct for real DOS/Windows behavior) */
#define    MAX_FAT16    0xFFF5            /* Max FAT16 clusters (differs from specs, but correct for real DOS/Windows behavior) */
#define    MAX_FAT32    0x0FFFFFF5        /* Max FAT32 clusters (not specified, practical limit) */
#define    MAX_EXFAT    0x7FFFFFFD        /* Max exFAT clusters (differs from specs, implementation limit) */


/* FatFs refers the FAT structure as simple byte array instead of structure member
/ because the C structure is not binary compatible between different platforms */

#define BS_JmpBoot            0        /* x86 jump instruction (3-byte) */
#define BS_OEMName            3        /* OEM name (8-byte) */
#define BPB_BytsPerSec        11        /* Sector size [byte] (WORD) */
#define BPB_SecPerClus        13        /* Cluster size [sector] (BYTE) */
#define BPB_RsvdSecCnt        14        /* Size of reserved area [sector] (WORD) */
#define BPB_NumFATs            16        /* Number of FATs (BYTE) */
#define BPB_RootEntCnt        17        /* Size of root directory area for FAT12/16 [entry] (WORD) */
#define BPB_TotSec16        19        /* Volume size (16-bit) [sector] (WORD) */
#define BPB_Media            21        /* Media descriptor byte (BYTE) */
#define BPB_FATSz16            22        /* FAT size (16-bit) [sector] (WORD) */
#define BPB_SecPerTrk        24        /* Track size for int13h [sector] (WORD) */
#define BPB_NumHeads        26        /* Number of heads for int13h (WORD) */
#define BPB_HiddSec            28        /* Volume offset from top of the drive (DWORD) */
#define BPB_TotSec32        32        /* Volume size (32-bit) [sector] (DWORD) */
#define BS_DrvNum            36        /* Physical drive number for int13h (BYTE) */
#define BS_NTres            37        /* Error flag (BYTE) */
#define BS_BootSig            38        /* Extended boot signature (BYTE) */
#define BS_VolID            39        /* Volume serial number (DWORD) */
#define BS_VolLab            43        /* Volume label string (8-byte) */
#define BS_FilSysType        54        /* File system type string (8-byte) */
#define BS_BootCode            62        /* Boot code (448-byte) */
#define BS_55AA                510        /* Signature word (WORD) */

#define BPB_FATSz32            36        /* FAT32: FAT size [sector] (DWORD) */
#define BPB_ExtFlags32        40        /* FAT32: Extended flags (WORD) */
#define BPB_FSVer32            42        /* FAT32: File system version (WORD) */
#define BPB_RootClus32        44        /* FAT32: Root directory cluster (DWORD) */
#define BPB_FSInfo32        48        /* FAT32: Offset of FSINFO sector (WORD) */
#define BPB_BkBootSec32        50        /* FAT32: Offset of backup boot sector (WORD) */
#define BS_DrvNum32            64        /* FAT32: Physical drive number for int13h (BYTE) */
#define BS_NTres32            65        /* FAT32: Error flag (BYTE) */
#define BS_BootSig32        66        /* FAT32: Extended boot signature (BYTE) */
#define BS_VolID32            67        /* FAT32: Volume serial number (DWORD) */
#define BS_VolLab32            71        /* FAT32: Volume label string (8-byte) */
#define BS_FilSysType32        82        /* FAT32: File system type string (8-byte) */
#define BS_BootCode32        90        /* FAT32: Boot code (420-byte) */

#define BPB_ZeroedEx        11        /* exFAT: MBZ field (53-byte) */
#define BPB_VolOfsEx        64        /* exFAT: Volume offset from top of the drive [sector] (QWORD) */
#define BPB_TotSecEx        72        /* exFAT: Volume size [sector] (QWORD) */
#define BPB_FatOfsEx        80        /* exFAT: FAT offset from top of the volume [sector] (DWORD) */
#define BPB_FatSzEx            84        /* exFAT: FAT size [sector] (DWORD) */
#define BPB_DataOfsEx        88        /* exFAT: Data offset from top of the volume [sector] (DWORD) */
#define BPB_NumClusEx        92        /* exFAT: Number of clusters (DWORD) */
#define BPB_RootClusEx        96        /* exFAT: Root directory start cluster (DWORD) */
#define BPB_VolIDEx            100        /* exFAT: Volume serial number (DWORD) */
#define BPB_FSVerEx            104        /* exFAT: File system version (WORD) */
#define BPB_VolFlagEx        106        /* exFAT: Volume flags (BYTE) */
#define BPB_ActFatEx        107        /* exFAT: Active FAT flags (BYTE) */
#define BPB_BytsPerSecEx    108        /* exFAT: Log2 of sector size in unit of byte (BYTE) */
#define BPB_SecPerClusEx    109        /* exFAT: Log2 of cluster size in unit of sector (BYTE) */
#define BPB_NumFATsEx        110        /* exFAT: Number of FATs (BYTE) */
#define BPB_DrvNumEx        111        /* exFAT: Physical drive number for int13h (BYTE) */
#define BPB_PercInUseEx        112        /* exFAT: Percent in use (BYTE) */
#define    BPB_RsvdEx            113        /* exFAT: Reserved (7-byte) */
#define BS_BootCodeEx        120        /* exFAT: Boot code (390-byte) */

#define    DIR_Name            0        /* Short file name (11-byte) */
#define    DIR_Attr            11        /* Attribute (BYTE) */
#define    DIR_NTres            12        /* Lower case flag (BYTE) */
#define DIR_CrtTime10        13        /* Created time sub-second (BYTE) */
#define    DIR_CrtTime            14        /* Created time (DWORD) */
#define DIR_LstAccDate        18        /* Last accessed date (WORD) */
#define    DIR_FstClusHI        20        /* Higher 16-bit of first cluster (WORD) */
#define    DIR_ModTime            22        /* Modified time (DWORD) */
#define    DIR_FstClusLO        26        /* Lower 16-bit of first cluster (WORD) */
#define    DIR_FileSize        28        /* File size (DWORD) */
#define    LDIR_Ord            0        /* LFN: LFN order and LLE flag (BYTE) */
#define    LDIR_Attr            11        /* LFN: LFN attribute (BYTE) */
#define    LDIR_Type            12        /* LFN: Entry type (BYTE) */
#define    LDIR_Chksum            13        /* LFN: Checksum of the SFN (BYTE) */
#define    LDIR_FstClusLO        26        /* LFN: MBZ field (WORD) */
#define    XDIR_Type            0        /* exFAT: Type of exFAT directory entry (BYTE) */
#define    XDIR_NumLabel        1        /* exFAT: Number of volume label characters (BYTE) */
#define    XDIR_Label            2        /* exFAT: Volume label (11-WORD) */
#define    XDIR_CaseSum        4        /* exFAT: Sum of case conversion table (DWORD) */
#define    XDIR_NumSec            1        /* exFAT: Number of secondary entries (BYTE) */
#define    XDIR_SetSum            2        /* exFAT: Sum of the set of directory entries (WORD) */
#define    XDIR_Attr            4        /* exFAT: File attribute (WORD) */
#define    XDIR_CrtTime        8        /* exFAT: Created time (DWORD) */
#define    XDIR_ModTime        12        /* exFAT: Modified time (DWORD) */
#define    XDIR_AccTime        16        /* exFAT: Last accessed time (DWORD) */
#define    XDIR_CrtTime10        20        /* exFAT: Created time subsecond (BYTE) */
#define    XDIR_ModTime10        21        /* exFAT: Modified time subsecond (BYTE) */
#define    XDIR_CrtTZ            22        /* exFAT: Created timezone (BYTE) */
#define    XDIR_ModTZ            23        /* exFAT: Modified timezone (BYTE) */
#define    XDIR_AccTZ            24        /* exFAT: Last accessed timezone (BYTE) */
#define    XDIR_GenFlags        33        /* exFAT: General secondary flags (WORD) */
#define    XDIR_NumName        35        /* exFAT: Number of file name characters (BYTE) */
#define    XDIR_NameHash        36        /* exFAT: Hash of file name (WORD) */
#define XDIR_ValidFileSize    40        /* exFAT: Valid file size (QWORD) */
#define    XDIR_FstClus        52        /* exFAT: First cluster of the file data (DWORD) */
#define    XDIR_FileSize        56        /* exFAT: File/Directory size (QWORD) */

#define    SZDIRE                32        /* Size of a directory entry */
#define    DDEM                0xE5    /* Deleted directory entry mark set to DIR_Name[0] */
#define    RDDEM                0x05    /* Replacement of the character collides with DDEM */
#define    LLEF                0x40    /* Last long entry flag in LDIR_Ord */

#define    FSI_LeadSig            0        /* FAT32 FSI: Leading signature (DWORD) */
#define    FSI_StrucSig        484        /* FAT32 FSI: Structure signature (DWORD) */
#define    FSI_Free_Count        488        /* FAT32 FSI: Number of free clusters (DWORD) */
#define    FSI_Nxt_Free        492        /* FAT32 FSI: Last allocated cluster (DWORD) */

#define MBR_Table            446        /* MBR: Offset of partition table in the MBR */
#define    SZ_PTE                16        /* MBR: Size of a partition table entry */
#define PTE_Boot            0        /* MBR PTE: Boot indicator */
#define PTE_StHead            1        /* MBR PTE: Start head */
#define PTE_StSec            2        /* MBR PTE: Start sector */
#define PTE_StCyl            3        /* MBR PTE: Start cylinder */
#define PTE_System            4        /* MBR PTE: System ID */
#define PTE_EdHead            5        /* MBR PTE: End head */
#define PTE_EdSec            6        /* MBR PTE: End sector */
#define PTE_EdCyl            7        /* MBR PTE: End cylinder */
#define PTE_StLba            8        /* MBR PTE: Start in LBA */
#define PTE_SizLba            12        /* MBR PTE: Size in LBA */


/* Post process after fatal error on file operation */
#define    ABORT(fs, res)        { fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define    ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }
#define    LEAVE_FF(fs, res)    { unlock_fs(fs, res); return res; }
#else
                                                                                                                        #define	ENTER_FF(fs)
#define LEAVE_FF(fs, res)	return res
#endif


/* Definitions of volume - partition conversion */
#if _MULTI_PARTITION
                                                                                                                        #define LD2PD(vol) VolToPart[vol].pd	/* Get physical drive number */
#define LD2PT(vol) VolToPart[vol].pt	/* Get partition index */
#else
#define LD2PD(vol) (BYTE)(vol)    /* Each logical drive is bound to the same physical drive number */
#define LD2PT(vol) 0            /* Find first valid partition or in SFD */
#endif


/* Definitions of sector size */
#if (_MAX_SS < _MIN_SS) || (_MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096) || (_MIN_SS != 512 && _MIN_SS != 1024 && _MIN_SS != 2048 && _MIN_SS != 4096)
#error Wrong sector size configuration
#endif
#if _MAX_SS == _MIN_SS
#define    SS(fs)    ((UINT)_MAX_SS)    /* Fixed sector size */
#else
#define	SS(fs)	((fs)->ssize)	/* Variable sector size */
#endif


/* Timestamp */
#if _FS_NORTC == 1
                                                                                                                        #if _NORTC_YEAR < 1980 || _NORTC_YEAR > 2107 || _NORTC_MON < 1 || _NORTC_MON > 12 || _NORTC_MDAY < 1 || _NORTC_MDAY > 31
#error Invalid _FS_NORTC settings
#endif
#define GET_FATTIME()	((DWORD)(_NORTC_YEAR - 1980) << 25 | (DWORD)_NORTC_MON << 21 | (DWORD)_NORTC_MDAY << 16)
#else
#define GET_FATTIME()    get_fattime()
#endif


/* File lock controls */
#if _FS_LOCK != 0
#if _FS_READONLY
#error _FS_LOCK must be 0 at read-only configuration
#endif
typedef struct {
    FATFS *fs;        /* Object ID 1, volume (NULL:blank entry) */
    DWORD clu;        /* Object ID 2, containing directory (0:root) */
    DWORD ofs;        /* Object ID 3, offset in the directory */
    WORD ctr;        /* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif





/*--------------------------------------------------------------------------

   Module Private Work Area

---------------------------------------------------------------------------*/

/* Remark: Variables defined here without initial value shall be guaranteed
/  zero/null at start-up. If not, the linker option or start-up routine is
/  not compliance with C standard. */

#if _VOLUMES < 1 || _VOLUMES > 10
#error Wrong _VOLUMES setting
#endif
static FATFS *FatFs[_VOLUMES];    /* Pointer to the file system objects (logical drives) */
static WORD Fsid;                /* File system mount ID */

#if _FS_RPATH != 0 && _VOLUMES >= 2
static BYTE CurrVol;			/* Current drive */
#endif

#if _FS_LOCK != 0
static FILESEM Files[_FS_LOCK];    /* Open object lock semaphores */
#endif

#if _USE_LFN == 0        /* Non-LFN configuration */
                                                                                                                        #define	DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define	FREE_NAMBUF()

#else					/* LFN configuration */
#if _MAX_LFN < 12 || _MAX_LFN > 255
#error Wrong _MAX_LFN value
#endif
#define MAXDIRB(nc)    ((nc + 44U) / 15 * SZDIRE)

#if _USE_LFN == 1        /* LFN enabled with static working buffer */
                                                                                                                        #if _FS_EXFAT
static BYTE	DirBuf[MAXDIRB(_MAX_LFN)];	/* Directory entry block scratchpad buffer */
#endif
static WCHAR LfnBuf[_MAX_LFN + 1];	/* LFN enabled with static working buffer */
#define	DEF_NAMBUF
#define INIT_NAMBUF(fs)
#define	FREE_NAMBUF()

#elif _USE_LFN == 2    /* LFN enabled with dynamic working buffer on the stack */
                                                                                                                        #if _FS_EXFAT
#define	DEF_NAMBUF		WCHAR lbuf[_MAX_LFN+1]; BYTE dbuf[MAXDIRB(_MAX_LFN)];
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; (fs)->dirbuf = dbuf; }
#define	FREE_NAMBUF()
#else
#define	DEF_NAMBUF		WCHAR lbuf[_MAX_LFN+1];
#define INIT_NAMBUF(fs)	{ (fs)->lfnbuf = lbuf; }
#define	FREE_NAMBUF()
#endif

#elif _USE_LFN == 3    /* LFN enabled with dynamic working buffer on the heap */
#if _FS_EXFAT
#define    DEF_NAMBUF        WCHAR *lfn;
#define INIT_NAMBUF(fs)    { lfn = ff_memalloc((_MAX_LFN+1)*2 + MAXDIRB(_MAX_LFN)); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; (fs)->dirbuf = (BYTE*)(lfn+_MAX_LFN+1); }
#define    FREE_NAMBUF()    ff_memfree(lfn)
#else
                                                                                                                        #define	DEF_NAMBUF		WCHAR *lfn;
#define INIT_NAMBUF(fs)	{ lfn = ff_memalloc((_MAX_LFN+1)*2); if (!lfn) LEAVE_FF(fs, FR_NOT_ENOUGH_CORE); (fs)->lfnbuf = lfn; }
#define	FREE_NAMBUF()	ff_memfree(lfn)
#endif

#else
#error Wrong _USE_LFN setting

#endif
#endif    /* else _USE_LFN == 0 */

#ifdef _EXCVT
static const BYTE ExCvt[] = _EXCVT;    /* Upper conversion table for SBCS extended characters */
#endif






/*--------------------------------------------------------------------------

   Module Private Functions

---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* Load/Store multi-byte word in the FAT structure                       */
/*-----------------------------------------------------------------------*/

static
WORD ld_word(const BYTE *ptr)    /*	 Load a 2-byte little-endian word */
{
    WORD rv;

    rv = ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

static
DWORD ld_dword(const BYTE *ptr)    /* Load a 4-byte little-endian word */
{
    DWORD rv;

    rv = ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

#if _FS_EXFAT

static
QWORD ld_qword(const BYTE *ptr)    /* Load an 8-byte little-endian word */
{
    QWORD rv;

    rv = ptr[7];
    rv = rv << 8 | ptr[6];
    rv = rv << 8 | ptr[5];
    rv = rv << 8 | ptr[4];
    rv = rv << 8 | ptr[3];
    rv = rv << 8 | ptr[2];
    rv = rv << 8 | ptr[1];
    rv = rv << 8 | ptr[0];
    return rv;
}

#endif

#if !_FS_READONLY

static
void st_word(BYTE *ptr, WORD val)    /* Store a 2-byte word in little-endian */
{
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
}

static
void st_dword(BYTE *ptr, DWORD val)    /* Store a 4-byte word in little-endian */
{
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
}

#if _FS_EXFAT

static
void st_qword(BYTE *ptr, QWORD val)    /* Store an 8-byte word in little-endian */
{
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
    val >>= 8;
    *ptr++ = (BYTE) val;
}

#endif
#endif    /* !_FS_READONLY */



/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy(void *dst, const void *src, UINT cnt) {
    BYTE *d = (BYTE *) dst;
    const BYTE *s = (const BYTE *) src;

    if (cnt) {
        do {
            *d++ = *s++;
        } while (--cnt);
    }
}

/* Fill memory block */
static
void mem_set(void *dst, int val, UINT cnt) {
    BYTE *d = (BYTE *) dst;

    do {
        *d++ = (BYTE) val;
    } while (--cnt);
}

/* Compare memory block */
static
int mem_cmp(const void *dst, const void *src, UINT cnt) {    /* ZR:same, NZ:different */
    const BYTE *d = (const BYTE *) dst, *s = (const BYTE *) src;
    int r = 0;

    do {
        r = *d++ - *s++;
    } while (--cnt && r == 0);

    return r;
}

/* Check if chr is contained in the string */
static
int chk_chr(const char *str, int chr) {    /* NZ:contained, ZR:not contained */
    while (*str && *str != chr) str++;
    return *str;
}


#if _FS_REENTRANT
/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
static
int lock_fs(
        FATFS *fs        /* File system object */
) {
    return (fs && ff_req_grant(fs->sobj)) ? 1 : 0;
}


static
void unlock_fs(
        FATFS *fs,        /* File system object */
        FRESULT res        /* Result code to be returned */
) {
    if (fs && res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE && res != FR_TIMEOUT) {
        ff_rel_grant(fs->sobj);
    }
}

#endif


#if _FS_LOCK != 0
/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/

static
FRESULT chk_lock(    /* Check if the file can be accessed */
        DIR *dp,        /* Directory object pointing the file to be checked */
        int acc            /* Desired access type (0:Read, 1:Write, 2:Delete/Rename) */
) {
    UINT i, be;

    /* Search file semaphore table */
    for (i = be = 0; i < _FS_LOCK; i++) {
        if (Files[i].fs) {    /* Existing entry */
            if (Files[i].fs == dp->obj.fs &&        /* Check if the object matched with an open object */
                Files[i].clu == dp->obj.sclust &&
                Files[i].ofs == dp->dptr)
                break;
        } else {            /* Blank entry */
            be = 1;
        }
    }
    if (i == _FS_LOCK) {    /* The object is not opened */
        return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;    /* Is there a blank entry for new object? */
    }

    /* The object has been opened. Reject any open against writing file and all write mode open */
    return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock(void)    /* Check if an entry is available for a new object */
{
    UINT i;

    for (i = 0; i < _FS_LOCK && Files[i].fs; i++);
    return (i == _FS_LOCK) ? 0 : 1;
}


static
UINT inc_lock(    /* Increment object open counter and returns its index (0:Internal error) */
        DIR *dp,    /* Directory object pointing the file to register or increment */
        int acc        /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
) {
    UINT i;


    for (i = 0; i < _FS_LOCK; i++) {    /* Find the object */
        if (Files[i].fs == dp->obj.fs &&
            Files[i].clu == dp->obj.sclust &&
            Files[i].ofs == dp->dptr)
            break;
    }

    if (i == _FS_LOCK) {                /* Not opened. Register it as new. */
        for (i = 0; i < _FS_LOCK && Files[i].fs; i++);
        if (i == _FS_LOCK) return 0;    /* No free entry to register (int err) */
        Files[i].fs = dp->obj.fs;
        Files[i].clu = dp->obj.sclust;
        Files[i].ofs = dp->dptr;
        Files[i].ctr = 0;
    }

    if (acc && Files[i].ctr) return 0;    /* Access violation (int err) */

    Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;    /* Set semaphore value */

    return i + 1;
}


static
FRESULT dec_lock(    /* Decrement object open counter */
        UINT i            /* Semaphore index (1..) */
) {
    WORD n;
    FRESULT res;


    if (--i < _FS_LOCK) {    /* Shift index number origin from 0 */
        n = Files[i].ctr;
        if (n == 0x100) n = 0;        /* If write mode open, delete the entry */
        if (n > 0) n--;                /* Decrement read mode open count */
        Files[i].ctr = n;
        if (n == 0) Files[i].fs = 0;    /* Delete the entry if open count gets zero */
        res = FR_OK;
    } else {
        res = FR_INT_ERR;            /* Invalid index nunber */
    }
    return res;
}


static
void clear_lock(    /* Clear lock entries of the volume */
        FATFS *fs
) {
    UINT i;

    for (i = 0; i < _FS_LOCK; i++) {
        if (Files[i].fs == fs) Files[i].fs = 0;
    }
}

#endif    /* _FS_LOCK != 0 */



/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the file system object               */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY

static
FRESULT sync_window(    /* Returns FR_OK or FR_DISK_ERROR */
        FATFS *fs            /* File system object */
) {
    DWORD wsect;
    UINT nf;
    FRESULT res = FR_OK;


    if (fs->wflag) {    /* Write back the sector if it is dirty */
        wsect = fs->winsect;    /* Current sector number */
        if (disk_write(fs->drv, fs->win, wsect, 1) != RES_OK) {
            res = FR_DISK_ERR;
        } else {
            fs->wflag = 0;
            if (wsect - fs->fatbase < fs->fsize) {        /* Is it in the FAT area? */
                for (nf = fs->n_fats; nf >= 2; nf--) {    /* Reflect the change to all FAT copies */
                    wsect += fs->fsize;
                    disk_write(fs->drv, fs->win, wsect, 1);
                }
            }
        }
    }
    return res;
}

#endif


static
FRESULT move_window(    /* Returns FR_OK or FR_DISK_ERROR */
        FATFS *fs,            /* File system object */
        DWORD sector        /* Sector number to make appearance in the fs->win[] */
) {
    FRESULT res = FR_OK;


    if (sector != fs->winsect) {    /* Window offset changed? */
#if !_FS_READONLY
        res = sync_window(fs);        /* Write-back changes */
#endif
        if (res == FR_OK) {            /* Fill sector window with new data */
            if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK) {
                sector = 0xFFFFFFFF;    /* Invalidate window if data is not reliable */
                res = FR_DISK_ERR;
                core_debug("move_window: disk_read failed\r\n");
            }
            fs->winsect = sector;
        }
    }
    return res;
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Synchronize file system and strage device                             */
/*-----------------------------------------------------------------------*/

static
FRESULT sync_fs(    /* FR_OK:succeeded, !=0:error */
        FATFS *fs        /* File system object */
) {
    FRESULT res;


    res = sync_window(fs);
    if (res == FR_OK) {
        /* Update FSInfo sector if needed */
        if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {
            /* Create FSInfo structure */
            mem_set(fs->win, 0, SS(fs));
            st_word(fs->win + BS_55AA, 0xAA55);
            st_dword(fs->win + FSI_LeadSig, 0x41615252);
            st_dword(fs->win + FSI_StrucSig, 0x61417272);
            st_dword(fs->win + FSI_Free_Count, fs->free_clst);
            st_dword(fs->win + FSI_Nxt_Free, fs->last_clst);
            /* Write it into the FSInfo sector */
            fs->winsect = fs->volbase + 1;
            disk_write(fs->drv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the physical drive */
        if (disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK) res = FR_DISK_ERR;
    }

    return res;
}

#endif



/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/

static
DWORD clust2sect(    /* !=0:Sector number, 0:Failed (invalid cluster#) */
        FATFS *fs,        /* File system object */
        DWORD clst        /* Cluster# to be converted */
) {
    clst -= 2;
    if (clst >= fs->n_fatent - 2) return 0;        /* Invalid cluster# */
    return clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/

static
DWORD get_fat(    /* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x7FFFFFFF:Cluster status */
        _FDID *obj,    /* Corresponding object */
        DWORD clst    /* Cluster number to get the value */
) {
    UINT wc, bc;
    DWORD val;
    FATFS *fs = obj->fs;


    if (clst < 2 || clst >= fs->n_fatent) {    /* Check if in valid range */
        val = 1;    /* Internal error */

    } else {
        val = 0xFFFFFFFF;    /* Default value falls on disk error */

        switch (fs->fs_type) {
            case FS_FAT12 :
                bc = (UINT) clst;
                bc += bc / 2;
                if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
                wc = fs->win[bc++ % SS(fs)];
                if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
                wc |= fs->win[bc % SS(fs)] << 8;
                val = (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
                break;

            case FS_FAT16 :
                if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) break;
                val = ld_word(fs->win + clst * 2 % SS(fs));
                break;

            case FS_FAT32 :
                if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
                val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x0FFFFFFF;
                break;
#if _FS_EXFAT
            case FS_EXFAT :
                if (obj->objsize) {
                    DWORD cofs = clst - obj->sclust;    /* Offset from start cluster */
                    DWORD clen = (DWORD) ((obj->objsize - 1) / SS(fs)) / fs->csize;    /* Number of clusters - 1 */

                    if (obj->stat == 2) {    /* Is there no valid chain on the FAT? */
                        if (cofs <= clen) {
                            val = (cofs == clen) ? 0x7FFFFFFF : clst + 1;    /* Generate the value */
                            break;
                        }
                    }
                    if (obj->stat == 3 && cofs < obj->n_cont) {    /* Is it in the 1st fragment? */
                        val = clst + 1;    /* Generate the value */
                        break;
                    }
                    if (obj->stat != 2) {    /* Get value from FAT if FAT chain is valid */
                        if (obj->n_frag != 0) {    /* Is it on the growing edge? */
                            val = 0x7FFFFFFF;    /* Generate EOC */
                        } else {
                            if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
                            val = ld_dword(fs->win + clst * 4 % SS(fs)) & 0x7FFFFFFF;
                        }
                        break;
                    }
                }
                /* go to default */
#endif
            default:
                val = 1;    /* Internal error */
        }
    }

    return val;
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/

static
FRESULT put_fat(    /* FR_OK(0):succeeded, !=0:error */
        FATFS *fs,        /* Corresponding file system object */
        DWORD clst,        /* FAT index number (cluster number) to be changed */
        DWORD val        /* New value to be set to the entry */
) {
    UINT bc;
    BYTE *p;
    FRESULT res = FR_INT_ERR;

    if (clst >= 2 && clst < fs->n_fatent) {    /* Check if in valid range */
        switch (fs->fs_type) {
            case FS_FAT12 :    /* Bitfield items */
                bc = (UINT) clst;
                bc += bc / 2;
                res = move_window(fs, fs->fatbase + (bc / SS(fs)));
                if (res != FR_OK) break;
                p = fs->win + bc++ % SS(fs);
                *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE) val << 4)) : (BYTE) val;
                fs->wflag = 1;
                res = move_window(fs, fs->fatbase + (bc / SS(fs)));
                if (res != FR_OK) break;
                p = fs->win + bc % SS(fs);
                *p = (clst & 1) ? (BYTE) (val >> 4) : ((*p & 0xF0) | ((BYTE) (val >> 8) & 0x0F));
                fs->wflag = 1;
                break;

            case FS_FAT16 :    /* WORD aligned items */
                res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
                if (res != FR_OK) break;
                st_word(fs->win + clst * 2 % SS(fs), (WORD) val);
                fs->wflag = 1;
                break;

            case FS_FAT32 :    /* DWORD aligned items */
#if _FS_EXFAT
            case FS_EXFAT :
#endif
                res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
                if (res != FR_OK) break;
                if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {
                    val = (val & 0x0FFFFFFF) | (ld_dword(fs->win + clst * 4 % SS(fs)) & 0xF0000000);
                }
                st_dword(fs->win + clst * 4 % SS(fs), val);
                fs->wflag = 1;
                break;
        }
    }
    return res;
}

#endif /* !_FS_READONLY */


#if _FS_EXFAT && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* exFAT: Accessing FAT and Allocation Bitmap                            */
/*-----------------------------------------------------------------------*/

/*--------------------------------------*/
/* Find a contiguous free cluster block */
/*--------------------------------------*/

static
DWORD find_bitmap(    /* 0:Not found, 2..:Cluster block found, 0xFFFFFFFF:Disk error */
        FATFS *fs,    /* File system object */
        DWORD clst,    /* Cluster number to scan from */
        DWORD ncl    /* Number of contiguous clusters to find (1..) */
) {
    BYTE bm, bv;
    UINT i;
    DWORD val, scl, ctr;


    clst -= 2;    /* The first bit in the bitmap corresponds to cluster #2 */
    if (clst >= fs->n_fatent - 2) clst = 0;
    scl = val = clst;
    ctr = 0;
    for (;;) {
        if (move_window(fs, fs->database + val / 8 / SS(fs)) != FR_OK)
            return 0xFFFFFFFF;    /* (assuming bitmap is located top of the cluster heap) */
        i = val / 8 % SS(fs);
        bm = 1 << (val % 8);
        do {
            do {
                bv = fs->win[i] & bm;
                bm <<= 1;        /* Get bit value */
                if (++val >= fs->n_fatent - 2) {    /* Next cluster (with wrap-around) */
                    val = 0;
                    bm = 0;
                    i = SS(fs);
                }
                if (!bv) {    /* Is it a free cluster? */
                    if (++ctr == ncl) return scl + 2;    /* Check if run length is sufficient for required */
                } else {
                    scl = val;
                    ctr = 0;        /* Encountered a cluster in-use, restart to scan */
                }
                if (val == clst) return 0;    /* All cluster scanned? */
            } while (bm);
            bm = 1;
        } while (++i < SS(fs));
    }
}


/*----------------------------------------*/
/* Set/Clear a block of allocation bitmap */
/*----------------------------------------*/

static
FRESULT change_bitmap(
        FATFS *fs,    /* File system object */
        DWORD clst,    /* Cluster number to change from */
        DWORD ncl,    /* Number of clusters to be changed */
        int bv        /* bit value to be set (0 or 1) */
) {
    BYTE bm;
    UINT i;
    DWORD sect;

    clst -= 2;    /* The first bit corresponds to cluster #2 */
    sect = fs->database +
           clst / 8 / SS(fs);    /* Sector address (assuming bitmap is located top of the cluster heap) */
    i = clst / 8 % SS(fs);                        /* Byte offset in the sector */
    bm = 1 << (clst % 8);                        /* Bit mask in the byte */
    for (;;) {
        if (move_window(fs, sect++) != FR_OK) return FR_DISK_ERR;
        do {
            do {
                if (bv == (int) ((fs->win[i] & bm) != 0)) return FR_INT_ERR;    /* Is the bit expected value? */
                fs->win[i] ^= bm;    /* Flip the bit */
                fs->wflag = 1;
                if (--ncl == 0) return FR_OK;    /* All bits processed? */
            } while (bm <<= 1);        /* Next bit */
            bm = 1;
        } while (++i < SS(fs));        /* Next byte */
        i = 0;
    }
}


/*---------------------------------------------*/
/* Fill the first fragment of the FAT chain    */
/*---------------------------------------------*/

static
FRESULT fill_first_frag(
        _FDID *obj    /* Pointer to the corresponding object */
) {
    FRESULT res;
    DWORD cl, n;

    if (obj->stat == 3) {    /* Has the object been changed 'fragmented'? */
        for (cl = obj->sclust, n = obj->n_cont; n; cl++, n--) {    /* Create cluster chain on the FAT */
            res = put_fat(obj->fs, cl, cl + 1);
            if (res != FR_OK) return res;
        }
        obj->stat = 0;    /* Change status 'FAT chain is valid' */
    }
    return FR_OK;
}


/*---------------------------------------------*/
/* Fill the last fragment of the FAT chain     */
/*---------------------------------------------*/

static
FRESULT fill_last_frag(
        _FDID *obj,    /* Pointer to the corresponding object */
        DWORD lcl,    /* Last cluster of the fragment */
        DWORD term    /* Value to set the last FAT entry */
) {
    FRESULT res;

    while (obj->n_frag > 0) {    /* Create the last chain on the FAT */
        res = put_fat(obj->fs, lcl - obj->n_frag + 1, (obj->n_frag > 1) ? lcl - obj->n_frag + 2 : term);
        if (res != FR_OK) return res;
        obj->n_frag--;
    }
    return FR_OK;
}

#endif    /* _FS_EXFAT && !_FS_READONLY */


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
static
FRESULT remove_chain(    /* FR_OK(0):succeeded, !=0:error */
        _FDID *obj,            /* Corresponding object */
        DWORD clst,            /* Cluster to remove a chain from */
        DWORD pclst            /* Previous cluster of clst (0:an entire chain) */
) {
    FRESULT res = FR_OK;
    DWORD nxt;
    FATFS *fs = obj->fs;
#if _FS_EXFAT || _USE_TRIM
    DWORD scl = clst, ecl = clst;
#endif
#if _USE_TRIM
    DWORD rt[2];
#endif

    if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;    /* Check if in valid range */

    /* Mark the previous cluster 'EOC' on the FAT if it exists */
    if (pclst && (!_FS_EXFAT || fs->fs_type != FS_EXFAT || obj->stat != 2)) {
        res = put_fat(fs, pclst, 0xFFFFFFFF);
        if (res != FR_OK) return res;
    }

    /* Remove the chain */
    do {
        nxt = get_fat(obj, clst);            /* Get cluster status */
        if (nxt == 0) break;                /* Empty cluster? */
        if (nxt == 1) return FR_INT_ERR;    /* Internal error? */
        if (nxt == 0xFFFFFFFF) return FR_DISK_ERR;    /* Disk error? */
        if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {
            res = put_fat(fs, clst, 0);        /* Mark the cluster 'free' on the FAT */
            if (res != FR_OK) return res;
        }
        if (fs->free_clst < fs->n_fatent - 2) {    /* Update FSINFO */
            fs->free_clst++;
            fs->fsi_flag |= 1;
        }
#if _FS_EXFAT || _USE_TRIM
        if (ecl + 1 == nxt) {    /* Is next cluster contiguous? */
            ecl = nxt;
        } else {                /* End of contiguous cluster block */
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                res = change_bitmap(fs, scl, ecl - scl + 1, 0);    /* Mark the cluster block 'free' on the bitmap */
                if (res != FR_OK) return res;
            }
#endif
#if _USE_TRIM
                                                                                                                                    rt[0] = clust2sect(fs, scl);					/* Start sector */
			rt[1] = clust2sect(fs, ecl) + fs->csize - 1;	/* End sector */
			disk_ioctl(fs->drv, CTRL_TRIM, rt);				/* Inform device the block can be erased */
#endif
            scl = ecl = nxt;
        }
#endif
        clst = nxt;                    /* Next cluster */
    } while (clst < fs->n_fatent);    /* Repeat while not the last link */

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {
        if (pclst == 0) {    /* Does the object have no chain? */
            obj->stat = 0;        /* Change the object status 'initial' */
        } else {
            if (obj->stat == 3 && pclst >= obj->sclust &&
                pclst <= obj->sclust + obj->n_cont) {    /* Did the chain get contiguous? */
                obj->stat = 2;    /* Change the object status 'contiguous' */
            }
        }
    }
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch a chain or Create a new chain                  */
/*-----------------------------------------------------------------------*/
static
DWORD create_chain(    /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
        _FDID *obj,            /* Corresponding object */
        DWORD clst            /* Cluster# to stretch, 0:Create a new chain */
) {
    DWORD cs, ncl, scl;
    FRESULT res;
    FATFS *fs = obj->fs;


    if (clst == 0) {    /* Create a new chain */
        scl = fs->last_clst;                /* Get suggested cluster to start from */
        if (scl == 0 || scl >= fs->n_fatent) scl = 1;
    } else {                /* Stretch current chain */
        cs = get_fat(obj, clst);            /* Check the cluster status */
        if (cs < 2) return 1;                /* Invalid FAT value */
        if (cs == 0xFFFFFFFF) return cs;    /* A disk error occurred */
        if (cs < fs->n_fatent) return cs;    /* It is already followed by next cluster */
        scl = clst;
    }

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
        ncl = find_bitmap(fs, scl, 1);                /* Find a free cluster */
        if (ncl == 0 || ncl == 0xFFFFFFFF) return ncl;    /* No free cluster or hard error? */
        res = change_bitmap(fs, ncl, 1, 1);            /* Mark the cluster 'in use' */
        if (res == FR_INT_ERR) return 1;
        if (res == FR_DISK_ERR) return 0xFFFFFFFF;
        if (clst == 0) {                            /* Is it a new chain? */
            obj->stat = 2;                            /* Set status 'contiguous' */
        } else {                                    /* It is a stretched chain */
            if (obj->stat == 2 && ncl != scl + 1) {    /* Is the chain got fragmented? */
                obj->n_cont = scl - obj->sclust;    /* Set size of the contiguous part */
                obj->stat = 3;                        /* Change status 'just fragmented' */
            }
        }
        if (obj->stat != 2) {    /* Is the file non-contiguous? */
            if (ncl == clst + 1) {    /* Is the cluster next to previous one? */
                obj->n_frag = obj->n_frag ? obj->n_frag + 1 : 2;    /* Increment size of last framgent */
            } else {                /* New fragment */
                if (obj->n_frag == 0) obj->n_frag = 1;
                res = fill_last_frag(obj, clst, ncl);    /* Fill last fragment on the FAT and link it to new one */
                if (res == FR_OK) obj->n_frag = 1;
            }
        }
    } else
#endif
    {    /* On the FAT12/16/32 volume */
        ncl = scl;    /* Start cluster */
        for (;;) {
            ncl++;                            /* Next cluster */
            if (ncl >= fs->n_fatent) {        /* Check wrap-around */
                ncl = 2;
                if (ncl > scl) return 0;    /* No free cluster */
            }
            cs = get_fat(obj, ncl);            /* Get the cluster status */
            if (cs == 0) break;                /* Found a free cluster */
            if (cs == 1 || cs == 0xFFFFFFFF) return cs;    /* An error occurred */
            if (ncl == scl) return 0;        /* No free cluster */
        }
        res = put_fat(fs, ncl, 0xFFFFFFFF);    /* Mark the new cluster 'EOC' */
        if (res == FR_OK && clst != 0) {
            res = put_fat(fs, clst, ncl);    /* Link it from the previous one if needed */
        }
    }

    if (res == FR_OK) {            /* Update FSINFO if function succeeded. */
        fs->last_clst = ncl;
        if (fs->free_clst <= fs->n_fatent - 2) fs->free_clst--;
        fs->fsi_flag |= 1;
    } else {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;    /* Failed. Generate error status */
    }

    return ncl;        /* Return new cluster number or error status */
}

#endif /* !_FS_READONLY */


#if _USE_FASTSEEK
/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

static
DWORD clmt_clust(    /* <2:Error, >=2:Cluster number */
        FIL *fp,        /* Pointer to the file object */
        FSIZE_t ofs        /* File offset to be converted to cluster# */
) {
    DWORD cl, ncl, *tbl;
    FATFS *fs = fp->obj.fs;


    tbl = fp->cltbl + 1;    /* Top of CLMT */
    cl = (DWORD) (ofs / SS(fs) / fs->csize);    /* Cluster order from top of the file */
    for (;;) {
        ncl = *tbl++;            /* Number of cluters in the fragment */
        if (ncl == 0) return 0;    /* End of table? (error) */
        if (cl < ncl) break;    /* In this fragment? */
        cl -= ncl;
        tbl++;        /* Next fragment */
    }
    return cl + *tbl;    /* Return the cluster number */
}

#endif    /* _USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi(    /* FR_OK(0):succeeded, !=0:error */
        DIR *dp,        /* Pointer to directory object */
        DWORD ofs        /* Offset of directory table */
) {
    DWORD csz, clst;
    FATFS *fs = dp->obj.fs;


    if (ofs >= (DWORD) ((_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR) ||
        ofs % SZDIRE) {    /* Check range of offset and alignment */
        return FR_INT_ERR;
    }
    dp->dptr = ofs;                /* Set current offset */
    clst = dp->obj.sclust;        /* Table start cluster (0:root) */
    if (clst == 0 && fs->fs_type >= FS_FAT32) {    /* Replace cluster# 0 with root cluster# */
        clst = fs->dirbase;
        if (_FS_EXFAT) dp->obj.stat = 0;    /* exFAT: Root dir has an FAT chain */
    }

    if (clst == 0) {    /* Static table (root-directory in FAT12/16) */
        if (ofs / SZDIRE >= fs->n_rootdir) return FR_INT_ERR;    /* Is index out of range? */
        dp->sect = fs->dirbase;

    } else {            /* Dynamic table (sub-directory or root-directory in FAT32+) */
        csz = (DWORD) fs->csize * SS(fs);    /* Bytes per cluster */
        while (ofs >= csz) {                /* Follow cluster chain */
            clst = get_fat(&dp->obj, clst);                /* Get next cluster */
            if (clst == 0xFFFFFFFF) return FR_DISK_ERR;    /* Disk error */
            if (clst < 2 || clst >= fs->n_fatent) return FR_INT_ERR;    /* Reached to end of table or internal error */
            ofs -= csz;
        }
        dp->sect = clust2sect(fs, clst);
    }
    dp->clust = clst;                    /* Current cluster# */
    if (!dp->sect) return FR_INT_ERR;
    dp->sect += ofs / SS(fs);            /* Sector# of the directory entry */
    dp->dir = fs->win + (ofs % SS(fs));    /* Pointer to the entry in the win[] */

    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next(    /* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
        DIR *dp,        /* Pointer to the directory object */
        int stretch        /* 0: Do not stretch table, 1: Stretch table if needed */
) {
    DWORD ofs, clst;
    FATFS *fs = dp->obj.fs;
#if !_FS_READONLY
    UINT n;
#endif

    ofs = dp->dptr + SZDIRE;    /* Next entry */
    if (!dp->sect || ofs >= (DWORD) ((_FS_EXFAT && fs->fs_type == FS_EXFAT) ? MAX_DIR_EX : MAX_DIR))
        return FR_NO_FILE;    /* Report EOT when offset has reached max value */

    if (ofs % SS(fs) == 0) {    /* Sector changed? */
        dp->sect++;                /* Next sector */

        if (!dp->clust) {        /* Static table */
            if (ofs / SZDIRE >= fs->n_rootdir) {    /* Report EOT if it reached end of static table */
                dp->sect = 0;
//                log_debug("1539 FR_NO_FILE");
                return FR_NO_FILE;
            }
        } else {                    /* Dynamic table */
            if ((ofs / SS(fs) & (fs->csize - 1)) == 0) {        /* Cluster changed? */
                clst = get_fat(&dp->obj, dp->clust);            /* Get next cluster */
                if (clst <= 1) return FR_INT_ERR;                /* Internal error */
                if (clst == 0xFFFFFFFF) return FR_DISK_ERR;        /* Disk error */
                if (clst >= fs->n_fatent) {                        /* Reached end of dynamic table */
#if !_FS_READONLY
                    if (!stretch) {                                /* If no stretch, report EOT */
                        dp->sect = 0;
//                        log_debug("1552 FR_NO_FILE");
                        return FR_NO_FILE;
                    }
                    clst = create_chain(&dp->obj, dp->clust);    /* Allocate a cluster */
                    if (clst == 0) return FR_DENIED;            /* No free cluster */
                    if (clst == 1) return FR_INT_ERR;            /* Internal error */
                    if (clst == 0xFFFFFFFF) return FR_DISK_ERR;    /* Disk error */
                    /* Clean-up the stretched table */
                    if (_FS_EXFAT) dp->obj.stat |= 4;            /* The directory needs to be updated */
                    if (sync_window(fs) != FR_OK) return FR_DISK_ERR;    /* Flush disk access window */
                    mem_set(fs->win, 0, SS(fs));                /* Clear window buffer */
                    for (n = 0, fs->winsect = clust2sect(fs, clst);
                         n < fs->csize; n++, fs->winsect++) {    /* Fill the new cluster with 0 */
                        fs->wflag = 1;
                        if (sync_window(fs) != FR_OK) return FR_DISK_ERR;
                    }
                    fs->winsect -= n;                            /* Restore window offset */
#else
                                                                                                                                            if (!stretch) dp->sect = 0;					/* (this line is to suppress compiler warning) */
					dp->sect = 0; return FR_NO_FILE;			/* Report EOT */
#endif
                }
                dp->clust = clst;        /* Initialize data for new cluster */
                dp->sect = clust2sect(fs, clst);
            }
        }
    }
    dp->dptr = ofs;                        /* Current entry */
    dp->dir = fs->win + ofs % SS(fs);    /* Pointer to the entry in the win[] */

    return FR_OK;
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve a block of directory entries             */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_alloc(    /* FR_OK(0):succeeded, !=0:error */
        DIR *dp,        /* Pointer to the directory object */
        UINT nent        /* Number of contiguous entries to allocate */
) {
    FRESULT res;
    UINT n;
    FATFS *fs = dp->obj.fs;


    res = dir_sdi(dp, 0);
    if (res == FR_OK) {
        n = 0;
        do {
            res = move_window(fs, dp->sect);
            if (res != FR_OK) break;
#if _FS_EXFAT
            if ((fs->fs_type == FS_EXFAT) ? (int) ((dp->dir[XDIR_Type] & 0x80) == 0) : (int) (
                    dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0)) {
#else
                if (dp->dir[DIR_Name] == DDEM || dp->dir[DIR_Name] == 0) {
#endif
                if (++n == nent) break;    /* A block of contiguous free entries is found */
            } else {
                n = 0;                    /* Not a blank entry. Restart to search */
            }
            res = dir_next(dp, 1);
        } while (res == FR_OK);    /* Next entry with table stretch enabled */
    }

    if (res == FR_NO_FILE) res = FR_DENIED;    /* No directory entry to allocate */
    return res;
}

#endif    /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT: Directory handling - Load/Store start cluster number             */
/*-----------------------------------------------------------------------*/

static
DWORD ld_clust(    /* Returns the top cluster value of the SFN entry */
        FATFS *fs,        /* Pointer to the fs object */
        const BYTE *dir    /* Pointer to the key entry */
) {
    DWORD cl;

    cl = ld_word(dir + DIR_FstClusLO);
    if (fs->fs_type == FS_FAT32) {
        cl |= (DWORD) ld_word(dir + DIR_FstClusHI) << 16;
    }

    return cl;
}


#if !_FS_READONLY

static
void st_clust(
        FATFS *fs,    /* Pointer to the fs object */
        BYTE *dir,    /* Pointer to the key entry */
        DWORD cl    /* Value to be set */
) {
    st_word(dir + DIR_FstClusLO, (WORD) cl);
    if (fs->fs_type == FS_FAT32) {
        st_word(dir + DIR_FstClusHI, (WORD) (cl >> 16));
    }
}

#endif


#if _USE_LFN != 0
/*------------------------------------------------------------------------*/
/* FAT-LFN: LFN handling                                                  */
/*------------------------------------------------------------------------*/
static
const BYTE LfnOfs[] = {1, 3, 5, 7, 9, 14, 16, 18, 20, 22, 24, 28,
                       30};    /* Offset of LFN characters in the directory entry */


/*--------------------------------------------------------*/
/* FAT-LFN: Compare a part of file name with an LFN entry */
/*--------------------------------------------------------*/
static
int cmp_lfn(                /* 1:matched, 0:not matched */
        const WCHAR *lfnbuf,    /* Pointer to the LFN working buffer to be compared */
        BYTE *dir                /* Pointer to the directory entry containing the part of LFN */
) {
    UINT i, s;
    WCHAR wc, uc;


    if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;    /* Check LDIR_FstClusLO */

    i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;    /* Offset in the LFN buffer */

    for (wc = 1, s = 0; s < 13; s++) {        /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);        /* Pick an LFN character */
        if (wc) {
            if (i >= _MAX_LFN || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) {    /* Compare it */
                return 0;                    /* Not matched */
            }
            wc = uc;
        } else {
            if (uc != 0xFFFF) return 0;        /* Check filler */
        }
    }

    if ((dir[LDIR_Ord] & LLEF) && wc && lfnbuf[i]) return 0;    /* Last segment matched but different length */

    return 1;        /* The part of LFN matched */
}


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 || _USE_LABEL || _FS_EXFAT
/*-----------------------------------------------------*/
/* FAT-LFN: Pick a part of file name from an LFN entry */
/*-----------------------------------------------------*/
static
int pick_lfn(            /* 1:succeeded, 0:buffer overflow or invalid LFN entry */
        WCHAR *lfnbuf,        /* Pointer to the LFN working buffer */
        BYTE *dir            /* Pointer to the LFN entry */
) {
    UINT i, s;
    WCHAR wc, uc;


    if (ld_word(dir + LDIR_FstClusLO) != 0) return 0;    /* Check LDIR_FstClusLO is 0 */

    i = ((dir[LDIR_Ord] & ~LLEF) - 1) * 13;    /* Offset in the LFN buffer */

    for (wc = 1, s = 0; s < 13; s++) {        /* Process all characters in the entry */
        uc = ld_word(dir + LfnOfs[s]);        /* Pick an LFN character */
        if (wc) {
            if (i >= _MAX_LFN) return 0;    /* Buffer overflow? */
            lfnbuf[i++] = wc = uc;            /* Store it */
        } else {
            if (uc != 0xFFFF) return 0;        /* Check filler */
        }
    }

    if (dir[LDIR_Ord] & LLEF) {                /* Put terminator if it is the last LFN part */
        if (i >= _MAX_LFN) return 0;        /* Buffer overflow? */
        lfnbuf[i] = 0;
    }

    return 1;        /* The part of LFN is valid */
}

#endif


#if !_FS_READONLY
/*-----------------------------------------*/
/* FAT-LFN: Create an entry of LFN entries */
/*-----------------------------------------*/
static
void put_lfn(
        const WCHAR *lfn,    /* Pointer to the LFN */
        BYTE *dir,            /* Pointer to the LFN entry to be created */
        BYTE ord,            /* LFN order (1-20) */
        BYTE sum            /* Checksum of the corresponding SFN */
) {
    UINT i, s;
    WCHAR wc;


    dir[LDIR_Chksum] = sum;            /* Set checksum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    st_word(dir + LDIR_FstClusLO, 0);

    i = (ord - 1) * 13;                /* Get offset in the LFN working buffer */
    s = wc = 0;
    do {
        if (wc != 0xFFFF) wc = lfn[i++];    /* Get an effective character */
        st_word(dir + LfnOfs[s], wc);        /* Put it */
        if (wc == 0) wc = 0xFFFF;        /* Padding characters for left locations */
    } while (++s < 13);
    if (wc == 0xFFFF || !lfn[i]) ord |= LLEF;    /* Last LFN part is the start of LFN sequence */
    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}

#endif    /* !_FS_READONLY */
#endif    /* _USE_LFN != 0 */


#if _USE_LFN != 0 && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Create a Numbered SFN                                        */
/*-----------------------------------------------------------------------*/

static
void gen_numname(
        BYTE *dst,            /* Pointer to the buffer to store numbered SFN */
        const BYTE *src,    /* Pointer to SFN */
        const WCHAR *lfn,    /* Pointer to LFN */
        UINT seq            /* Sequence number */
) {
    BYTE ns[8], c;
    UINT i, j;
    WCHAR wc;
    DWORD sr;


    mem_cpy(dst, src, 11);

    if (seq > 5) {    /* In case of many collisions, generate a hash number instead of sequential number */
        sr = seq;
        while (*lfn) {    /* Create a CRC */
            wc = *lfn++;
            for (i = 0; i < 16; i++) {
                sr = (sr << 1) + (wc & 1);
                wc >>= 1;
                if (sr & 0x10000) sr ^= 0x11021;
            }
        }
        seq = (UINT) sr;
    }

    /* itoa (hexdecimal) */
    i = 7;
    do {
        c = (BYTE) ((seq % 16) + '0');
        if (c > '9') c += 7;
        ns[i--] = c;
        seq /= 16;
    } while (seq);
    ns[i] = '~';

    /* Append the number */
    for (j = 0; j < i && dst[j] != ' '; j++) {
        if (IsDBCS1(dst[j])) {
            if (j == i - 1) break;
            j++;
        }
    }
    do {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    } while (j < 8);
}

#endif    /* _USE_LFN != 0 && !_FS_READONLY */


#if _USE_LFN != 0
/*-----------------------------------------------------------------------*/
/* FAT-LFN: Calculate checksum of an SFN entry                           */
/*-----------------------------------------------------------------------*/

static
BYTE sum_sfn(
        const BYTE *dir        /* Pointer to the SFN entry */
) {
    BYTE sum = 0;
    UINT n = 11;

    do {
        sum = (sum >> 1) + (sum << 7) + *dir++;
    } while (--n);
    return sum;
}

#endif    /* _USE_LFN != 0 */


#if _FS_EXFAT
/*-----------------------------------------------------------------------*/
/* exFAT: Checksum                                                       */
/*-----------------------------------------------------------------------*/

static
WORD xdir_sum(            /* Get checksum of the directoly block */
        const BYTE *dir        /* Directory entry block to be calculated */
) {
    UINT i, szblk;
    WORD sum;


    szblk = (dir[XDIR_NumSec] + 1) * SZDIRE;
    for (i = sum = 0; i < szblk; i++) {
        if (i == XDIR_SetSum) {    /* Skip sum field */
            i++;
        } else {
            sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
        }
    }
    return sum;
}


static
WORD xname_sum(        /* Get check sum (to be used as hash) of the name */
        const WCHAR *name    /* File name to be calculated */
) {
    WCHAR chr;
    WORD sum = 0;


    while ((chr = *name++) != 0) {
        chr = ff_wtoupper(chr);        /* File name needs to be ignored case */
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr & 0xFF);
        sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + (chr >> 8);
    }
    return sum;
}


#if !_FS_READONLY && _USE_MKFS

static
DWORD xsum32(
        BYTE dat,    /* Data to be sumed */
        DWORD sum    /* Previous value */
) {
    sum = ((sum & 1) ? 0x80000000 : 0) + (sum >> 1) + dat;
    return sum;
}

#endif


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
/*------------------------------------------------------*/
/* exFAT: Get object information from a directory block */
/*------------------------------------------------------*/

static
void get_xdir_info(
        BYTE *dirb,            /* Pointer to the direcotry entry block 85+C0+C1s */
        FILINFO *fno        /* Buffer to store the extracted file information */
) {
    UINT di, si;
    WCHAR w;
#if !_LFN_UNICODE
    UINT nc;
#endif

    /* Get file name */
    di = 0;
#if _LFN_UNICODE
                                                                                                                            for (si = SZDIRE * 2; di < dirb[XDIR_NumName]; si += 2, di++) {
		if ((si % SZDIRE) == 0) si += 2;		/* Skip entry type field */
		w = ld_word(dirb + si);					/* Get a character */
		if (di >= _MAX_LFN) { di = 0; break; }	/* Buffer overflow --> inaccessible object name */
		fno->fname[di] = w;						/* Store it */
	}
#else
    for (si = SZDIRE * 2, nc = 0; nc < dirb[XDIR_NumName]; si += 2, nc++) {
        if ((si % SZDIRE) == 0) si += 2;        /* Skip entry type field */
        w = ff_convert(ld_word(dirb + si), 0);    /* Get a character and Unicode -> OEM */
        if (_DF1S && w >= 0x100) {                /* Is it a double byte char? (always false at SBCS cfg) */
            fno->fname[di++] = (char) (w >> 8);    /* Put 1st byte of the DBC */
        }
        if (w == 0 || di >= _MAX_LFN) {
            di = 0;
            break;
        }    /* Invalid char or buffer overflow --> inaccessible object name */
        fno->fname[di++] = (char) w;
    }
#endif
    if (di == 0) fno->fname[di++] = '?';    /* Inaccessible object name? */
    fno->fname[di] = 0;                        /* Terminate file name */

    fno->altname[0] = 0;                            /* No SFN */
    fno->fattrib = dirb[XDIR_Attr];                    /* Attribute */
    fno->fsize = (fno->fattrib & AM_DIR) ? 0 : ld_qword(dirb + XDIR_FileSize);    /* Size */
    fno->ftime = ld_word(dirb + XDIR_ModTime + 0);    /* Time */
    fno->fdate = ld_word(dirb + XDIR_ModTime + 2);    /* Date */
}

#endif    /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 */


/*-----------------------------------*/
/* exFAT: Get a directry entry block */
/*-----------------------------------*/

static
FRESULT load_xdir(    /* FR_INT_ERR: invalid entry block */
        DIR *dp            /* Pointer to the reading direcotry object pointing the 85 entry */
) {
    FRESULT res;
    UINT i, sz_ent;
    BYTE *dirb = dp->obj.fs->dirbuf;    /* Pointer to the on-memory direcotry entry block 85+C0+C1s */


    /* Load 85 entry */
    res = move_window(dp->obj.fs, dp->sect);
    if (res != FR_OK) return res;
    if (dp->dir[XDIR_Type] != 0x85) {
        core_debug("FR_INT_ERR");
        return FR_INT_ERR;
    }
    mem_cpy(dirb + 0, dp->dir, SZDIRE);
    sz_ent = (dirb[XDIR_NumSec] + 1) * SZDIRE;
    if (sz_ent < 3 * SZDIRE || sz_ent > 19 * SZDIRE) {
        core_debug("FR_INT_ERR");
        return FR_INT_ERR;
    }

    /* Load C0 entry */
    res = dir_next(dp, 0);
    if (res != FR_OK) return res;
    res = move_window(dp->obj.fs, dp->sect);
    if (res != FR_OK) return res;
    if (dp->dir[XDIR_Type] != 0xC0) {
        core_debug("FR_INT_ERR");
        return FR_INT_ERR;
    }
    mem_cpy(dirb + SZDIRE, dp->dir, SZDIRE);
    if (MAXDIRB(dirb[XDIR_NumName]) > sz_ent) {
        core_debug("FR_INT_ERR");
        return FR_INT_ERR;
    }

    /* Load C1 entries */
    i = SZDIRE * 2;    /* C1 offset */
    do {
        res = dir_next(dp, 0);
        if (res != FR_OK) return res;
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) return res;
        if (dp->dir[XDIR_Type] != 0xC1) {
            core_debug("FR_INT_ERR");
            return FR_INT_ERR;
        }
        if (i < MAXDIRB(_MAX_LFN)) mem_cpy(dirb + i, dp->dir, SZDIRE);
    } while ((i += SZDIRE) < sz_ent);

    /* Sanity check (do it when accessible object name) */
    if (i <= MAXDIRB(_MAX_LFN)) {
        if (xdir_sum(dirb) != ld_word(dirb + XDIR_SetSum)) {
            core_debug("FR_INT_ERR");
            return FR_INT_ERR;
        }
    }
    return FR_OK;
}


#if !_FS_READONLY || _FS_RPATH != 0
/*------------------------------------------------*/
/* exFAT: Load the object's directory entry block */
/*------------------------------------------------*/
static
FRESULT load_obj_dir(
        DIR *dp,            /* Blank directory object to be used to access containing direcotry */
        const _FDID *obj    /* Object with its containing directory information */
) {
    FRESULT res;

    /* Open object containing directory */
    dp->obj.fs = obj->fs;
    dp->obj.sclust = obj->c_scl;
    dp->obj.stat = (BYTE) obj->c_size;
    dp->obj.objsize = obj->c_size & 0xFFFFFF00;
    dp->blk_ofs = obj->c_ofs;

    res = dir_sdi(dp, dp->blk_ofs);    /* Goto object's entry block */
    if (res == FR_OK) {
        res = load_xdir(dp);        /* Load the object's entry block */
    }
    return res;
}

#endif


#if !_FS_READONLY
/*-----------------------------------------------*/
/* exFAT: Store the directory block to the media */
/*-----------------------------------------------*/
static
FRESULT store_xdir(
        DIR *dp                /* Pointer to the direcotry object */
) {
    FRESULT res;
    UINT nent;
    BYTE *dirb = dp->obj.fs->dirbuf;    /* Pointer to the direcotry entry block 85+C0+C1s */

    /* Create set sum */
    st_word(dirb + XDIR_SetSum, xdir_sum(dirb));
    nent = dirb[XDIR_NumSec] + 1;

    /* Store the set of directory to the volume */
    res = dir_sdi(dp, dp->blk_ofs);
    while (res == FR_OK) {
        res = move_window(dp->obj.fs, dp->sect);
        if (res != FR_OK) break;
        mem_cpy(dp->dir, dirb, SZDIRE);
        dp->obj.fs->wflag = 1;
        if (--nent == 0) break;
        dirb += SZDIRE;
        res = dir_next(dp, 0);
    }
    return (res == FR_OK || res == FR_DISK_ERR) ? res : FR_INT_ERR;
}



/*-------------------------------------------*/
/* exFAT: Create a new directory enrty block */
/*-------------------------------------------*/

static
void create_xdir(
        BYTE *dirb,            /* Pointer to the direcotry entry block buffer */
        const WCHAR *lfn    /* Pointer to the nul terminated file name */
) {
    UINT i;
    BYTE nb, nc;
    WCHAR chr;


    /* Create 85+C0 entry */
    mem_set(dirb, 0, 2 * SZDIRE);
    dirb[XDIR_Type] = 0x85;
    dirb[XDIR_Type + SZDIRE] = 0xC0;

    /* Create C1 entries */
    nc = 0;
    nb = 1;
    chr = 1;
    i = SZDIRE * 2;
    do {
        dirb[i++] = 0xC1;
        dirb[i++] = 0;    /* Entry type C1 */
        do {    /* Fill name field */
            if (chr && (chr = lfn[nc]) != 0) nc++;    /* Get a character if exist */
            st_word(dirb + i, chr);        /* Store it */
        } while ((i += 2) % SZDIRE != 0);
        nb++;
    } while (lfn[nc]);    /* Fill next entry if any char follows */

    dirb[XDIR_NumName] = nc;    /* Set name length */
    dirb[XDIR_NumSec] = nb;        /* Set block length */
    st_word(dirb + XDIR_NameHash, xname_sum(lfn));    /* Set name hash */
}

#endif    /* !_FS_READONLY */
#endif    /* _FS_EXFAT */


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 || _USE_LABEL || _FS_EXFAT
/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_read(
        DIR *dp,        /* Pointer to the directory object */
        int vol            /* Filtered by 0:file/directory or 1:volume label */
) {
    FRESULT res = FR_NO_FILE;
    FATFS *fs = dp->obj.fs;
    BYTE a, c;
#if _USE_LFN != 0
    BYTE ord = 0xFF, sum = 0xFF;
#endif

    while (dp->sect) {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];    /* Test for the entry type */
        if (c == 0) {
            res = FR_NO_FILE;
            // log_debug("FR_NO_FILE 2153");
            break; /* Reached to end of the directory */
        }
#if _FS_EXFAT
        if (fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
            if (_USE_LABEL && vol) {
                if (c == 0x83) break;    /* Volume label entry? */
            } else {
                if (c == 0x85) {        /* Start of the file entry block? */
                    dp->blk_ofs = dp->dptr;    /* Get location of the block */
                    res = load_xdir(dp);    /* Load the entry block */
                    if (res == FR_OK) {
                        dp->obj.attr = fs->dirbuf[XDIR_Attr] & AM_MASK;    /* Get attribute */
                    }
                    break;
                }
            }
        } else
#endif
        {    /* On the FAT12/16/32 volume */
            dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;    /* Get attribute */
#if _USE_LFN != 0    /* LFN configuration */
            if (c == DDEM || c == '.' || (int) ((a & ~AM_ARC) == AM_VOL) != vol) {    /* An entry without valid data */
                ord = 0xFF;
            } else {
                if (a == AM_LFN) {            /* An LFN entry is found */
                    if (c & LLEF) {            /* Is it start of an LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        c &= (BYTE) ~LLEF;
                        ord = c;
                        dp->blk_ofs = dp->dptr;
                    }
                    /* Check LFN validity and capture it */
                    ord = (c == ord && sum == dp->dir[LDIR_Chksum] && pick_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                } else {                    /* An SFN entry is found */
                    if (ord || sum != sum_sfn(dp->dir)) {    /* Is there a valid LFN? */
                        dp->blk_ofs = 0xFFFFFFFF;            /* It has no LFN. */
                    }
                    break;
                }
            }
#else		/* Non LFN configuration */
                                                                                                                                    if (c != DDEM && c != '.' && a != AM_LFN && (int)((a & ~AM_ARC) == AM_VOL) == vol) {	/* Is it a valid entry? */
                break;
            }
#endif
        }
        res = dir_next(dp, 0);        /* Next entry */
        if (res != FR_OK) {
//            log_debug("2201");
            break;
        }
    }

    if (res != FR_OK) {
        dp->sect = 0;        /* Terminate the read operation on error or EOT */
        // log_debug("not ok 2204");
    }
    return res;
}

#endif    /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */



/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find(    /* FR_OK(0):succeeded, !=0:error */
        DIR *dp            /* Pointer to the directory object with the file name */
) {
    FRESULT res;
    FATFS *fs = dp->obj.fs;
    BYTE c;
#if _USE_LFN != 0
    BYTE a, ord, sum;
#endif
    // log_debug("dir_find %s", dp->fn);
    res = dir_sdi(dp, 0);            /* Rewind directory object */
    if (res != FR_OK) return res;
#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
        BYTE nc;
        UINT di, ni;
        WORD hash = xname_sum(fs->lfnbuf);        /* Hash value of the name to find */

        while ((res = dir_read(dp, 0)) == FR_OK) {    /* Read an item */
#if _MAX_LFN < 255
            if (fs->dirbuf[XDIR_NumName] > _MAX_LFN) continue;			/* Skip comparison if inaccessible object name */
#endif
            if (ld_word(fs->dirbuf + XDIR_NameHash) != hash) continue;    /* Skip comparison if hash mismatched */
            for (nc = fs->dirbuf[XDIR_NumName], di =
                    SZDIRE * 2, ni = 0; nc; nc--, di += 2, ni++) {    /* Compare the name */
                if ((di % SZDIRE) == 0) di += 2;
                if (ff_wtoupper(ld_word(fs->dirbuf + di)) != ff_wtoupper(fs->lfnbuf[ni])) break;
            }
            if (nc == 0 && !fs->lfnbuf[ni]) break;    /* Name matched? */
        }
        return res;
    }
#endif
    /* On the FAT12/16/32 volume */
#if _USE_LFN != 0
    ord = sum = 0xFF;
    dp->blk_ofs = 0xFFFFFFFF;    /* Reset LFN sequence */
#endif
    do {
        res = move_window(fs, dp->sect);
        if (res != FR_OK) break;
        c = dp->dir[DIR_Name];
        if (c == 0) {
            res = FR_NO_FILE;
            // log_debug("2252 NO_FILE");
            break;
        }    /* Reached to end of table */
#if _USE_LFN != 0    /* LFN configuration */
        dp->obj.attr = a = dp->dir[DIR_Attr] & AM_MASK;
        if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {    /* An entry without valid data */
            ord = 0xFF;
            dp->blk_ofs = 0xFFFFFFFF;    /* Reset LFN sequence */
        } else {
            if (a == AM_LFN) {            /* An LFN entry is found */
                if (!(dp->fn[NSFLAG] & NS_NOLFN)) {
                    if (c & LLEF) {        /* Is it start of LFN sequence? */
                        sum = dp->dir[LDIR_Chksum];
                        c &= (BYTE) ~LLEF;
                        ord = c;    /* LFN start order */
                        dp->blk_ofs = dp->dptr;    /* Start offset of LFN */
                    }
                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dp->dir[LDIR_Chksum] && cmp_lfn(fs->lfnbuf, dp->dir)) ? ord - 1 : 0xFF;
                }
            } else {                    /* An SFN entry is found */
                if (!ord && sum == sum_sfn(dp->dir)) break;    /* LFN matched? */
                if (!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dp->dir, dp->fn, 11)) break;    /* SFN matched? */
                ord = 0xFF;
                dp->blk_ofs = 0xFFFFFFFF;    /* Reset LFN sequence */
            }
        }
#else		/* Non LFN configuration */
                                                                                                                                dp->obj.attr = dp->dir[DIR_Attr] & AM_MASK;
		if (!(dp->dir[DIR_Attr] & AM_VOL) && !mem_cmp(dp->dir, dp->fn, 11)) break;	/* Is it a valid entry? */
#endif
        res = dir_next(dp, 0);    /* Next entry */
    } while (res == FR_OK);

    return res;
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/

static
FRESULT
dir_register(    /* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
        DIR *dp                /* Target directory with object name to be created */
) {
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if _USE_LFN != 0    /* LFN configuration */
    UINT n, nlen, nent;
    BYTE sn[12], sum;


    if (dp->fn[NSFLAG] & (NS_DOT | NS_NONAME)) return FR_INVALID_NAME;    /* Check name validity */
    for (nlen = 0; fs->lfnbuf[nlen]; nlen++);    /* Get lfn length */

#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
        DIR dj;

        nent = (nlen + 14) / 15 + 2;    /* Number of entries to allocate (85+C0+C1s) */
        res = dir_alloc(dp, nent);        /* Allocate entries */
        if (res != FR_OK) return res;
        dp->blk_ofs = dp->dptr - SZDIRE * (nent - 1);    /* Set the allocated entry block offset */

        if (dp->obj.sclust != 0 && (dp->obj.stat & 4)) {    /* Has the sub-directory been stretched? */
            dp->obj.objsize += (DWORD) fs->csize * SS(fs);    /* Increase the directory size by cluster size */
            res = fill_first_frag(&dp->obj);                /* Fill first fragment on the FAT if needed */
            if (res != FR_OK) return res;
            res = fill_last_frag(&dp->obj, dp->clust, 0xFFFFFFFF);    /* Fill last fragment on the FAT if needed */
            if (res != FR_OK) return res;
            res = load_obj_dir(&dj, &dp->obj);                /* Load the object status */
            if (res != FR_OK) return res;
            st_qword(fs->dirbuf + XDIR_FileSize, dp->obj.objsize);        /* Update the allocation status */
            st_qword(fs->dirbuf + XDIR_ValidFileSize, dp->obj.objsize);
            fs->dirbuf[XDIR_GenFlags] = dp->obj.stat | 1;
            res = store_xdir(&dj);                            /* Store the object status */
            if (res != FR_OK) return res;
        }

        create_xdir(fs->dirbuf, fs->lfnbuf);    /* Create on-memory directory block to be written later */
        return FR_OK;
    }
#endif
    /* On the FAT12/16/32 volume */
    mem_cpy(sn, dp->fn, 12);
    if (sn[NSFLAG] & NS_LOSS) {            /* When LFN is out of 8.3 format, generate a numbered name */
        dp->fn[NSFLAG] = NS_NOLFN;        /* Find only SFN */
        for (n = 1; n < 100; n++) {
            gen_numname(dp->fn, sn, fs->lfnbuf, n);    /* Generate a numbered name */
            res = dir_find(dp);                /* Check if the name collides with existing SFN */
            if (res != FR_OK) break;
        }
        if (n == 100) return FR_DENIED;        /* Abort if too many collisions */
        if (res != FR_NO_FILE) return res;    /* Abort if the result is other than 'not collided' */
        dp->fn[NSFLAG] = sn[NSFLAG];
    }

    /* Create an SFN with/without LFNs. */
    nent = (sn[NSFLAG] & NS_LFN) ? (nlen + 12) / 13 + 1 : 1;    /* Number of entries to allocate */
    res = dir_alloc(dp, nent);        /* Allocate entries */
    if (res == FR_OK && --nent) {    /* Set LFN entry if needed */
        res = dir_sdi(dp, dp->dptr - nent * SZDIRE);
        if (res == FR_OK) {
            sum = sum_sfn(dp->fn);    /* Checksum value of the SFN tied to the LFN */
            do {                    /* Store LFN entries in bottom first */
                res = move_window(fs, dp->sect);
                if (res != FR_OK) break;
                put_lfn(fs->lfnbuf, dp->dir, (BYTE) nent, sum);
                fs->wflag = 1;
                res = dir_next(dp, 0);    /* Next entry */
            } while (res == FR_OK && --nent);
        }
    }

#else	/* Non LFN configuration */
    res = dir_alloc(dp, 1);		/* Allocate an entry for SFN */

#endif

    /* Set SFN entry */
    if (res == FR_OK) {
        res = move_window(fs, dp->sect);
        if (res == FR_OK) {
            mem_set(dp->dir, 0, SZDIRE);    /* Clean the entry */
            mem_cpy(dp->dir + DIR_Name, dp->fn, 11);    /* Put SFN */
#if _USE_LFN != 0
            dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);    /* Put NT flag */
#endif
            fs->wflag = 1;
        }
    }

    return res;
}

#endif /* !_FS_READONLY */


#if !_FS_READONLY && _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_remove(    /* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
        DIR *dp                /* Directory object pointing the entry to be removed */
) {
    FRESULT res;
    FATFS *fs = dp->obj.fs;
#if _USE_LFN != 0    /* LFN configuration */
    DWORD last = dp->dptr;

    res = (dp->blk_ofs == 0xFFFFFFFF) ? FR_OK : dir_sdi(dp,
                                                        dp->blk_ofs);    /* Goto top of the entry block if LFN is exist */
    if (res == FR_OK) {
        do {
            res = move_window(fs, dp->sect);
            if (res != FR_OK) break;
            /* Mark an entry 'deleted' */
            if (_FS_EXFAT && fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
                dp->dir[XDIR_Type] &= 0x7F;
            } else {                                    /* On the FAT12/16/32 volume */
                dp->dir[DIR_Name] = DDEM;
            }
            fs->wflag = 1;
            if (dp->dptr >= last) break;    /* If reached last entry then all entries of the object has been deleted. */
            res = dir_next(dp, 0);    /* Next entry */
        } while (res == FR_OK);
        if (res == FR_NO_FILE) res = FR_INT_ERR;
    }
#else			/* Non LFN configuration */

                                                                                                                            res = move_window(fs, dp->sect);
	if (res == FR_OK) {
		dp->dir[DIR_Name] = DDEM;
		fs->wflag = 1;
	}
#endif

    return res;
}

#endif /* !_FS_READONLY && _FS_MINIMIZE == 0 */


#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/

static
void get_fileinfo(        /* No return code */
        DIR *dp,            /* Pointer to the directory object */
        FILINFO *fno        /* Pointer to the file information to be filled */
) {
    UINT i, j;
    TCHAR c;
    DWORD tm;
#if _USE_LFN != 0
    WCHAR w, lfv;
    FATFS *fs = dp->obj.fs;
#endif


    fno->fname[0] = 0;        /* Invaidate file info */
    if (!dp->sect) return;    /* Exit if read pointer has reached end of directory */

#if _USE_LFN != 0    /* LFN configuration */
#if _FS_EXFAT
    if (fs->fs_type == FS_EXFAT) {    /* On the exFAT volume */
        get_xdir_info(fs->dirbuf, fno);
        return;
    } else
#endif
    {    /* On the FAT12/16/32 volume */
        if (dp->blk_ofs != 0xFFFFFFFF) {    /* Get LFN if available */
            i = j = 0;
            while ((w = fs->lfnbuf[j++]) != 0) {    /* Get an LFN character */
#if !_LFN_UNICODE
                w = ff_convert(w, 0);        /* Unicode -> OEM */
                if (w == 0) {
                    i = 0;
                    break;
                }    /* No LFN if it could not be converted */
                if (_DF1S && w >= 0x100) {    /* Put 1st byte if it is a DBC (always false at SBCS cfg) */
                    fno->fname[i++] = (char) (w >> 8);
                }
#endif
                if (i >= _MAX_LFN) {
                    i = 0;
                    break;
                }    /* No LFN if buffer overflow */
                fno->fname[i++] = (TCHAR) w;
            }
            fno->fname[i] = 0;    /* Terminate the LFN */
        }
    }

    i = j = 0;
    lfv = fno->fname[i];    /* LFN is exist if non-zero */
    while (i < 11) {        /* Copy name body and extension */
        c = (TCHAR) dp->dir[i++];
        if (c == ' ') continue;                /* Skip padding spaces */
        if (c == RDDEM) c = (TCHAR) DDEM;    /* Restore replaced DDEM character */
        if (i == 9) {                        /* Insert a . if extension is exist */
            if (!lfv) fno->fname[j] = '.';
            fno->altname[j++] = '.';
        }
#if _LFN_UNICODE
                                                                                                                                if (IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dp->dir[i])) {
			c = c << 8 | dp->dir[i++];
		}
		c = ff_convert(c, 1);	/* OEM -> Unicode */
		if (!c) c = '?';
#endif
        fno->altname[j] = c;
        if (!lfv) {
            if (IsUpper(c) && (dp->dir[DIR_NTres] & ((i >= 9) ? NS_EXT : NS_BODY))) {
                c += 0x20;            /* To lower */
            }
            fno->fname[j] = c;
        }
        j++;
    }
    if (!lfv) {
        fno->fname[j] = 0;
        if (!dp->dir[DIR_NTres]) j = 0;    /* Altname is no longer needed if neither LFN nor case info is exist. */
    }
    fno->altname[j] = 0;    /* Terminate the SFN */

#else	/* Non-LFN configuration */
                                                                                                                            i = j = 0;
	while (i < 11) {		/* Copy name body and extension */
		c = (TCHAR)dp->dir[i++];
		if (c == ' ') continue;				/* Skip padding spaces */
		if (c == RDDEM) c = (TCHAR)DDEM;	/* Restore replaced DDEM character */
		if (i == 9) fno->fname[j++] = '.';	/* Insert a . if extension is exist */
		fno->fname[j++] = c;
	}
	fno->fname[j] = 0;
#endif

    fno->fattrib = dp->dir[DIR_Attr];                /* Attribute */
    fno->fsize = ld_dword(dp->dir + DIR_FileSize);    /* Size */
    tm = ld_dword(dp->dir + DIR_ModTime);            /* Timestamp */
    fno->ftime = (WORD) tm;
    fno->fdate = (WORD) (tm >> 16);
}

#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 */


#if _USE_FIND && _FS_MINIMIZE <= 1
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Pattern matching                                                      */
/*-----------------------------------------------------------------------*/

static
WCHAR get_achar (		/* Get a character and advances ptr 1 or 2 */
	const TCHAR** ptr	/* Pointer to pointer to the SBCS/DBCS/Unicode string */
)
{
#if !_LFN_UNICODE
	WCHAR chr;

	chr = (BYTE)*(*ptr)++;					/* Get a byte */
	if (IsLower(chr)) chr -= 0x20;			/* To upper ASCII char */
#ifdef _EXCVT
	if (chr >= 0x80) chr = ExCvt[chr - 0x80];	/* To upper SBCS extended char */
#else
	if (IsDBCS1(chr) && IsDBCS2(**ptr)) {		/* Get DBC 2nd byte if needed */
		chr = chr << 8 | (BYTE)*(*ptr)++;
	}
#endif
	return chr;
#else
	return ff_wtoupper(*(*ptr)++);			/* Get a word and to upper */
#endif
}


static
int pattern_matching (	/* 0:not matched, 1:matched */
	const TCHAR* pat,	/* Matching pattern */
	const TCHAR* nam,	/* String to be tested */
	int skip,			/* Number of pre-skip chars (number of ?s) */
	int inf				/* Infinite search (* specified) */
)
{
	const TCHAR *pp, *np;
	WCHAR pc, nc;
	int nm, nx;


	while (skip--) {				/* Pre-skip name chars */
		if (!get_achar(&nam)) return 0;	/* Branch mismatched if less name chars */
	}
	if (!*pat && inf) return 1;		/* (short circuit) */

	do {
		pp = pat; np = nam;			/* Top of pattern and name to match */
		for (;;) {
			if (*pp == '?' || *pp == '*') {	/* Wildcard? */
				nm = nx = 0;
				do {				/* Analyze the wildcard chars */
					if (*pp++ == '?') nm++; else nx = 1;
				} while (*pp == '?' || *pp == '*');
				if (pattern_matching(pp, np, nm, nx)) return 1;	/* Test new branch (recurs upto number of wildcard blocks in the pattern) */
				nc = *np; break;	/* Branch mismatched */
			}
			pc = get_achar(&pp);	/* Get a pattern char */
			nc = get_achar(&np);	/* Get a name char */
			if (pc != nc) break;	/* Branch mismatched? */
			if (pc == 0) return 1;	/* Branch matched? (matched at end of both strings) */
		}
		get_achar(&nam);			/* nam++ */
	} while (inf && nc);			/* Retry until end of name if infinite search is specified */

	return 0;
}

#endif /* _USE_FIND && _FS_MINIMIZE <= 1 */



/*-----------------------------------------------------------------------*/
/* Pick a top segment and create the object name in directory form       */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name(    /* FR_OK: successful, FR_INVALID_NAME: could not create */
        DIR *dp,            /* Pointer to the directory object */
        const TCHAR **path    /* Pointer to pointer to the segment in the path string */
) {
#if _USE_LFN != 0    /* LFN configuration */
    BYTE b, cf;
    WCHAR w, *lfn;
    UINT i, ni, si, di;
    const TCHAR *p;

    /* Create LFN in Unicode */
    p = *path;
    lfn = dp->obj.fs->lfnbuf;
    si = di = 0;
    for (;;) {
        w = p[si++];                    /* Get a character */
        if (w < ' ') break;                /* Break if end of the path name */
        if (w == '/' || w == '\\') {    /* Break if a separator is found */
            while (p[si] == '/' || p[si] == '\\') si++;    /* Skip duplicated separator if exist */
            break;
        }
        if (di >= _MAX_LFN) return FR_INVALID_NAME;    /* Reject too long name */
#if !_LFN_UNICODE
        w &= 0xFF;
        if (IsDBCS1(w)) {                /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
            b = (BYTE) p[si++];            /* Get 2nd byte */
            w = (w << 8) + b;            /* Create a DBC */
            if (!IsDBCS2(b)) return FR_INVALID_NAME;    /* Reject invalid sequence */
        }
        w = ff_convert(w, 1);            /* Convert ANSI/OEM to Unicode */
        if (!w) return FR_INVALID_NAME;    /* Reject invalid code */
#endif
        if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) return FR_INVALID_NAME;    /* Reject illegal characters for LFN */
        lfn[di++] = w;                    /* Store the Unicode character */
    }
    *path = &p[si];                        /* Return pointer to the next segment */
    cf = (w < ' ') ? NS_LAST : 0;        /* Set last segment flag if end of the path */
#if _FS_RPATH != 0
                                                                                                                            if ((di == 1 && lfn[di - 1] == '.') ||
		(di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {	/* Is this segment a dot name? */
		lfn[di] = 0;
		for (i = 0; i < 11; i++)		/* Create dot name for SFN entry */
			dp->fn[i] = (i < di) ? '.' : ' ';
		dp->fn[i] = cf | NS_DOT;		/* This is a dot entry */
		return FR_OK;
	}
#endif
    while (di) {                        /* Snip off trailing spaces and dots if exist */
        w = lfn[di - 1];
        if (w != ' ' && w != '.') break;
        di--;
    }
    lfn[di] = 0;                        /* LFN is created */
    if (di == 0) return FR_INVALID_NAME;    /* Reject nul name */

    /* Create SFN in directory form */
    mem_set(dp->fn, ' ', 11);
    for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++);    /* Strip leading spaces and dots */
    if (si) cf |= NS_LOSS | NS_LFN;
    while (di && lfn[di - 1] != '.') di--;    /* Find extension (di<=si: no extension) */

    i = b = 0;
    ni = 8;
    for (;;) {
        w = lfn[si++];                    /* Get an LFN character */
        if (!w) break;                    /* Break on end of the LFN */
        if (w == ' ' || (w == '.' && si != di)) {    /* Remove spaces and dots */
            cf |= NS_LOSS | NS_LFN;
            continue;
        }

        if (i >= ni || si == di) {        /* Extension or end of SFN */
            if (ni == 11) {                /* Long extension */
                cf |= NS_LOSS | NS_LFN;
                break;
            }
            if (si != di) cf |= NS_LOSS | NS_LFN;    /* Out of 8.3 format */
            if (si > di) break;            /* No extension */
            si = di;
            i = 8;
            ni = 11;    /* Enter extension section */
            b <<= 2;
            continue;
        }

        if (w >= 0x80) {                /* Non ASCII character */
#ifdef _EXCVT
            w = ff_convert(w, 0);        /* Unicode -> OEM code */
            if (w) w = ExCvt[w - 0x80];    /* Convert extended character to upper (SBCS) */
#else
            w = ff_convert(ff_wtoupper(w), 0);	/* Upper converted Unicode -> OEM code */
#endif
            cf |= NS_LFN;                /* Force create LFN entry */
        }

        if (_DF1S && w >= 0x100) {        /* Is this DBC? (always false at SBCS cfg) */
            if (i >= ni - 1) {
                cf |= NS_LOSS | NS_LFN;
                i = ni;
                continue;
            }
            dp->fn[i++] = (BYTE) (w >> 8);
        } else {                        /* SBC */
            if (!w || chk_chr("+,;=[]", w)) {    /* Replace illegal characters for SFN */
                w = '_';
                cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
            } else {
                if (IsUpper(w)) {        /* ASCII large capital */
                    b |= 2;
                } else {
                    if (IsLower(w)) {    /* ASCII small capital */
                        b |= 1;
                        w -= 0x20;
                    }
                }
            }
        }
        dp->fn[i++] = (BYTE) w;
    }

    if (dp->fn[0] == DDEM) dp->fn[0] = RDDEM;    /* If the first character collides with DDEM, replace it with RDDEM */

    if (ni == 8) b <<= 2;
    if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)
        cf |= NS_LFN;    /* Create LFN entry when there are composite capitals */
    if (!(cf &
          NS_LFN)) {                        /* When LFN is in 8.3 format without extended character, NT flags are created */
        if ((b & 0x03) == 0x01) cf |= NS_EXT;    /* NT flag (Extension has only small capital) */
        if ((b & 0x0C) == 0x04) cf |= NS_BODY;    /* NT flag (Filename has only small capital) */
    }

    dp->fn[NSFLAG] = cf;    /* SFN is created */

    return FR_OK;


#else	/* _USE_LFN != 0 : Non-LFN configuration */
                                                                                                                            BYTE c, d, *sfn;
	UINT ni, si, i;
	const char *p;

	/* Create file name in directory form */
	p = *path; sfn = dp->fn;
	mem_set(sfn, ' ', 11);
	si = i = 0; ni = 8;
#if _FS_RPATH != 0
	if (p[si] == '.') { /* Is this a dot entry? */
		for (;;) {
			c = (BYTE)p[si++];
			if (c != '.' || si >= 3) break;
			sfn[i++] = c;
		}
		if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
		*path = p + si;								/* Return pointer to the next segment */
		sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;	/* Set last segment flag if end of the path */
		return FR_OK;
	}
#endif
	for (;;) {
		c = (BYTE)p[si++];
		if (c <= ' ') break; 			/* Break if end of the path name */
		if (c == '/' || c == '\\') {	/* Break if a separator is found */
			while (p[si] == '/' || p[si] == '\\') si++;	/* Skip duplicated separator if exist */
			break;
		}
		if (c == '.' || i >= ni) {		/* End of body or over size? */
			if (ni == 11 || c != '.') return FR_INVALID_NAME;	/* Over size or invalid dot */
			i = 8; ni = 11;				/* Goto extension */
			continue;
		}
		if (c >= 0x80) {				/* Extended character? */
#ifdef _EXCVT
			c = ExCvt[c - 0x80];		/* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
			return FR_INVALID_NAME;		/* Reject extended characters (ASCII only cfg) */
#endif
#endif
		}
		if (IsDBCS1(c)) {				/* Check if it is a DBC 1st byte (always false at SBCS cfg.) */
			d = (BYTE)p[si++];			/* Get 2nd byte */
			if (!IsDBCS2(d) || i >= ni - 1) return FR_INVALID_NAME;	/* Reject invalid DBC */
			sfn[i++] = c;
			sfn[i++] = d;
		} else {						/* SBC */
			if (chk_chr("\"*+,:;<=>\?[]|\x7F", c)) return FR_INVALID_NAME;	/* Reject illegal chrs for SFN */
			if (IsLower(c)) c -= 0x20;	/* To upper */
			sfn[i++] = c;
		}
	}
	*path = p + si;						/* Return pointer to the next segment */
	if (i == 0) return FR_INVALID_NAME;	/* Reject nul string */

	if (sfn[0] == DDEM) sfn[0] = RDDEM;	/* If the first character collides with DDEM, replace it with RDDEM */
	sfn[NSFLAG] = (c <= ' ') ? NS_LAST : 0;		/* Set last segment flag if end of the path */

	return FR_OK;
#endif /* _USE_LFN != 0 */
}




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path(    /* FR_OK(0): successful, !=0: error code */
        DIR *dp,            /* Directory object to return last directory and found object */
        const TCHAR *path    /* Full-path string to find a file or directory */
) {
    FRESULT res;
    BYTE ns;
    _FDID *obj = &dp->obj;
    FATFS *fs = obj->fs;


#if _FS_RPATH != 0
                                                                                                                            if (*path != '/' && *path != '\\') {	/* Without heading separator */
		obj->sclust = fs->cdir;				/* Start from current directory */
	} else
#endif
    {                                        /* With heading separator */
        while (*path == '/' || *path == '\\') path++;    /* Strip heading separator */
        obj->sclust = 0;                    /* Start from root directory */
    }
#if _FS_EXFAT
    obj->n_frag = 0;    /* Invalidate last fragment counter of the object */
#if _FS_RPATH != 0
                                                                                                                            if (fs->fs_type == FS_EXFAT && obj->sclust) {	/* Retrieve the sub-directory status if needed */
		DIR dj;

		obj->c_scl = fs->cdc_scl;
		obj->c_size = fs->cdc_size;
		obj->c_ofs = fs->cdc_ofs;
		res = load_obj_dir(&dj, obj);
		if (res != FR_OK) return res;
		obj->objsize = ld_dword(fs->dirbuf + XDIR_FileSize);
		obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;
	}
#endif
#endif

    if ((UINT) *path < ' ') {                /* Null path name is the origin directory itself */
        dp->fn[NSFLAG] = NS_NONAME;
        res = dir_sdi(dp, 0);

    } else {                                /* Follow path */
        for (;;) {
            res = create_name(dp, &path);    /* Get a segment name of the path */
            if (res != FR_OK) break;
            res = dir_find(dp);                /* Find an object with the segment name */
            ns = dp->fn[NSFLAG];
            if (res != FR_OK) {                /* Failed to find the object */
                if (res == FR_NO_FILE) {    /* Object is not found */
                    if (_FS_RPATH && (ns & NS_DOT)) {    /* If dot entry is not exist, stay there */
                        if (!(ns & NS_LAST)) continue;    /* Continue to follow if not last segment */
                        dp->fn[NSFLAG] = NS_NONAME;
                        res = FR_OK;
                    } else {                            /* Could not find the object */
                        if (!(ns & NS_LAST)) res = FR_NO_PATH;    /* Adjust error code if not last segment */
                    }
                }
                break;
            }
            if (ns & NS_LAST) break;            /* Last segment matched. Function completed. */
            /* Get into the sub-directory */
            if (!(obj->attr & AM_DIR)) {        /* It is not a sub-directory and cannot follow */
                res = FR_NO_PATH;
                break;
            }
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {        /* Save containing directory information for next dir */
                obj->c_scl = obj->sclust;
                obj->c_size = ((DWORD) obj->objsize & 0xFFFFFF00) | obj->stat;
                obj->c_ofs = dp->blk_ofs;
                obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);    /* Open next directory */
                obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;
                obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
            } else
#endif
            {
                obj->sclust = ld_clust(fs, fs->win + dp->dptr % SS(fs));    /* Open next directory */
            }
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Get logical drive number from path name                               */
/*-----------------------------------------------------------------------*/

static
int get_ldnumber(        /* Returns logical drive number (-1:invalid drive) */
        const TCHAR **path    /* Pointer to pointer to the path name */
) {
    const TCHAR *tp, *tt;
    UINT i;
    int vol = -1;
#if _STR_VOLUME_ID        /* Find string drive id */
                                                                                                                            static const char* const volid[] = {_VOLUME_STRS};
	const char *sp;
	char c;
	TCHAR tc;
#endif


    if (*path) {    /* If the pointer is not a null */
        for (tt = *path; (UINT) *tt >= (_USE_LFN ? ' ' : '!') && *tt != ':'; tt++);    /* Find ':' in the path */
        if (*tt == ':') {    /* If a ':' is exist in the path name */
            tp = *path;
            i = *tp++ - '0';
            if (i < 10 && tp == tt) {    /* Is there a numeric drive id? */
                if (i < _VOLUMES) {    /* If a drive id is found, get the value and strip it */
                    vol = (int) i;
                    *path = ++tt;
                }
            }
#if _STR_VOLUME_ID
                                                                                                                                    else {	/* No numeric drive number, find string drive id */
				i = 0; tt++;
				do {
					sp = volid[i]; tp = *path;
					do {	/* Compare a string drive id with path name */
						c = *sp++; tc = *tp++;
						if (IsLower(tc)) tc -= 0x20;
					} while (c && (TCHAR)c == tc);
				} while ((c || tp != tt) && ++i < _VOLUMES);	/* Repeat for each id until pattern match */
				if (i < _VOLUMES) {	/* If a drive id is found, get the value and strip it */
					vol = (int)i;
					*path = tt;
				}
			}
#endif
            return vol;
        }
#if _FS_RPATH != 0 && _VOLUMES >= 2
        vol = CurrVol;	/* Current drive */
#else
        vol = 0;        /* Drive 0 */
#endif
    }
    return vol;
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT boot sector                   */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs(    /* 0:FAT, 1:exFAT, 2:Valid BS but not FAT, 3:Not a BS, 4:Disk error */
        FATFS *fs,    /* File system object */
        DWORD sect    /* Sector# (lba) to load and check if it is an FAT-VBR or not */
) {
    fs->wflag = 0;
    fs->winsect = 0xFFFFFFFF;        /* Invaidate window */
    if (move_window(fs, sect) != FR_OK) return 4;    /* Load boot record */

    if (ld_word(fs->win + BS_55AA) != 0xAA55)
        return 3;    /* Check boot record signature (always placed here even if the sector size is >512) */

    if (fs->win[BS_JmpBoot] == 0xE9 || (fs->win[BS_JmpBoot] == 0xEB && fs->win[BS_JmpBoot + 2] == 0x90)) {
        if ((ld_dword(fs->win + BS_FilSysType) & 0xFFFFFF) == 0x544146) return 0;    /* Check "FAT" string */
        if (ld_dword(fs->win + BS_FilSysType32) == 0x33544146) return 0;            /* Check "FAT3" string */
    }
#if _FS_EXFAT
    if (!mem_cmp(fs->win + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11)) return 1;
#endif
    return 2;
}




/*-----------------------------------------------------------------------*/
/* Find logical drive and check if the volume is mounted                 */
/*-----------------------------------------------------------------------*/

static
FRESULT find_volume(    /* FR_OK(0): successful, !=0: any error occurred */
        const TCHAR **path,    /* Pointer to pointer to the path name (drive number) */
        FATFS **rfs,        /* Pointer to pointer to the found file system object */
        BYTE mode            /* !=0: Check write protection for write access */
) {
    BYTE fmt, *pt;
    int vol;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
    WORD nrsv;
    FATFS *fs;
    UINT i;


    /* Get logical drive number */
    *rfs = 0;
    vol = get_ldnumber(path);
    if (vol < 0) return FR_INVALID_DRIVE;

    /* Check if the file system object is valid or not */
    fs = FatFs[vol];                    /* Get pointer to the file system object */
    if (!fs) return FR_NOT_ENABLED;        /* Is the file system object available? */

    ENTER_FF(fs);                        /* Lock the volume */
    *rfs = fs;                            /* Return pointer to the file system object */

    mode &= (BYTE) ~FA_READ;                /* Desired access mode, write access or not */
    if (fs->fs_type) {                    /* If the volume has been mounted */
        stat = disk_status(fs->drv);
        if (!(stat & STA_NOINIT)) {        /* and the physical drive is kept initialized */
            if (!_FS_READONLY && mode && (stat & STA_PROTECT)) {    /* Check write protection if needed */
                return FR_WRITE_PROTECTED;
            }
            return FR_OK;                /* The file system object is valid */
        }
    }

    /* The file system object is not valid. */
    /* Following code attempts to mount the volume. (analyze BPB and initialize the fs object) */

    fs->fs_type = 0;                    /* Clear the file system object */
    fs->drv = LD2PD(vol);                /* Bind the logical drive and a physical drive */
    stat = disk_initialize(fs->drv);    /* Initialize the physical drive */
    if (stat & STA_NOINIT) {            /* Check if the initialization succeeded */
        return FR_NOT_READY;            /* Failed to initialize due to no medium or hard error */
    }
    if (!_FS_READONLY && mode && (stat & STA_PROTECT)) { /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
    }
#if _MAX_SS != _MIN_SS                    /* Get sector size (multiple sector size cfg only) */
                                                                                                                            if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK) return FR_DISK_ERR;
	if (SS(fs) > _MAX_SS || SS(fs) < _MIN_SS || (SS(fs) & (SS(fs) - 1))) return FR_DISK_ERR;
#endif

    /* Find an FAT partition on the drive. Supports only generic partitioning rules, FDISK and SFD. */
    bsect = 0;
    fmt = check_fs(fs, bsect);            /* Load sector 0 and check if it is an FAT-VBR as SFD */
    if (fmt == 2 || (fmt < 2 && LD2PT(vol) != 0)) {    /* Not an FAT-VBR or forced partition number */
        for (i = 0; i < 4; i++) {        /* Get partition offset */
            pt = fs->win + (MBR_Table + i * SZ_PTE);
            br[i] = pt[PTE_System] ? ld_dword(pt + PTE_StLba) : 0;
        }
        i = LD2PT(vol);                    /* Partition number: 0:auto, 1-4:forced */
        if (i) i--;
        do {                            /* Find an FAT volume */
            bsect = br[i];
            fmt = bsect ? check_fs(fs, bsect) : 3;    /* Check the partition */
        } while (LD2PT(vol) == 0 && fmt >= 2 && ++i < 4);
    }
    if (fmt == 4) return FR_DISK_ERR;        /* An error occured in the disk I/O layer */
    if (fmt >= 2) return FR_NO_FILESYSTEM;    /* No FAT volume is found */

    /* An FAT volume is found (bsect). Following code initializes the file system object */

#if _FS_EXFAT
    if (fmt == 1) {
        QWORD maxlba;

        for (i = BPB_ZeroedEx; i < BPB_ZeroedEx + 53 && fs->win[i] == 0; i++);    /* Check zero filler */
        if (i < BPB_ZeroedEx + 53) return FR_NO_FILESYSTEM;

        if (ld_word(fs->win + BPB_FSVerEx) != 0x100)
            return FR_NO_FILESYSTEM;    /* Check exFAT revision (Must be 1.0) */

        if (1 << fs->win[BPB_BytsPerSecEx] !=
            SS(fs)) {    /* (BPB_BytsPerSecEx must be equal to the physical sector size) */
            return FR_NO_FILESYSTEM;
        }

        maxlba = ld_qword(fs->win + BPB_TotSecEx) + bsect;    /* Last LBA + 1 of the volume */
        if (maxlba >= 0x100000000) return FR_NO_FILESYSTEM;    /* (It cannot be handled in 32-bit LBA) */

        fs->fsize = ld_dword(fs->win + BPB_FatSzEx);    /* Number of sectors per FAT */

        fs->n_fats = fs->win[BPB_NumFATsEx];            /* Number of FATs */
        if (fs->n_fats != 1) return FR_NO_FILESYSTEM;    /* (Supports only 1 FAT) */

        fs->csize = 1 << fs->win[BPB_SecPerClusEx];        /* Cluster size */
        if (fs->csize == 0) return FR_NO_FILESYSTEM;    /* (Must be 1..32768) */

        nclst = ld_dword(fs->win + BPB_NumClusEx);        /* Number of clusters */
        if (nclst > MAX_EXFAT) return FR_NO_FILESYSTEM;    /* (Too many clusters) */
        fs->n_fatent = nclst + 2;

        /* Boundaries and Limits */
        fs->volbase = bsect;
        fs->database = bsect + ld_dword(fs->win + BPB_DataOfsEx);
        fs->fatbase = bsect + ld_dword(fs->win + BPB_FatOfsEx);
        if (maxlba < (QWORD) fs->database + nclst * fs->csize)
            return FR_NO_FILESYSTEM;    /* (Volume size must not be smaller than the size requiered) */
        fs->dirbase = ld_dword(fs->win + BPB_RootClusEx);

        /* Check if bitmap location is in assumption (at the first cluster) */
        if (move_window(fs, clust2sect(fs, fs->dirbase)) != FR_OK) return FR_DISK_ERR;
        for (i = 0; i < SS(fs); i += SZDIRE) {
            if (fs->win[i] == 0x81 && ld_dword(fs->win + i + 20) == 2) break;    /* 81 entry with cluster #2? */
        }
        if (i == SS(fs)) return FR_NO_FILESYSTEM;
#if !_FS_READONLY
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;        /* Initialize cluster allocation information */
#endif
        fmt = FS_EXFAT;            /* FAT sub-type */
    } else
#endif    /* _FS_EXFAT */
    {
        if (ld_word(fs->win + BPB_BytsPerSec) != SS(fs))
            return FR_NO_FILESYSTEM;    /* (BPB_BytsPerSec must be equal to the physical sector size) */

        fasize = ld_word(fs->win + BPB_FATSz16);        /* Number of sectors per FAT */
        if (fasize == 0) fasize = ld_dword(fs->win + BPB_FATSz32);
        fs->fsize = fasize;

        fs->n_fats = fs->win[BPB_NumFATs];                /* Number of FATs */
        if (fs->n_fats != 1 && fs->n_fats != 2) return FR_NO_FILESYSTEM;    /* (Must be 1 or 2) */
        fasize *= fs->n_fats;                            /* Number of sectors for FAT area */

        fs->csize = fs->win[BPB_SecPerClus];            /* Cluster size */
        if (fs->csize == 0 || (fs->csize & (fs->csize - 1))) return FR_NO_FILESYSTEM;    /* (Must be power of 2) */

        fs->n_rootdir = ld_word(fs->win + BPB_RootEntCnt);    /* Number of root directory entries */
        if (fs->n_rootdir % (SS(fs) / SZDIRE)) return FR_NO_FILESYSTEM;    /* (Must be sector aligned) */

        tsect = ld_word(fs->win + BPB_TotSec16);        /* Number of sectors on the volume */
        if (tsect == 0) tsect = ld_dword(fs->win + BPB_TotSec32);

        nrsv = ld_word(fs->win + BPB_RsvdSecCnt);        /* Number of reserved sectors */
        if (nrsv == 0) return FR_NO_FILESYSTEM;            /* (Must not be 0) */

        /* Determine the FAT sub type */
        sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZDIRE);    /* RSV + FAT + DIR */
        if (tsect < sysect) return FR_NO_FILESYSTEM;    /* (Invalid volume size) */
        nclst = (tsect - sysect) / fs->csize;            /* Number of clusters */
        if (nclst == 0) return FR_NO_FILESYSTEM;        /* (Invalid volume size) */
        fmt = FS_FAT32;
        if (nclst <= MAX_FAT16) fmt = FS_FAT16;
        if (nclst <= MAX_FAT12) fmt = FS_FAT12;

        /* Boundaries and Limits */
        fs->n_fatent = nclst + 2;                        /* Number of FAT entries */
        fs->volbase = bsect;                            /* Volume start sector */
        fs->fatbase = bsect + nrsv;                    /* FAT start sector */
        fs->database = bsect + sysect;                    /* Data start sector */
        if (fmt == FS_FAT32) {
            if (ld_word(fs->win + BPB_FSVer32) != 0) return FR_NO_FILESYSTEM;    /* (Must be FAT32 revision 0.0) */
            if (fs->n_rootdir) return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must be 0) */
            fs->dirbase = ld_dword(fs->win + BPB_RootClus32);    /* Root directory start cluster */
            szbfat = fs->n_fatent * 4;                    /* (Needed FAT size) */
        } else {
            if (fs->n_rootdir == 0) return FR_NO_FILESYSTEM;/* (BPB_RootEntCnt must not be 0) */
            fs->dirbase = fs->fatbase + fasize;            /* Root directory start sector */
            szbfat = (fmt == FS_FAT16) ?                /* (Needed FAT size) */
                     fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
        }
        if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))
            return FR_NO_FILESYSTEM;    /* (BPB_FATSz must not be less than the size needed) */

#if !_FS_READONLY
        /* Get FSINFO if available */
        fs->last_clst = fs->free_clst = 0xFFFFFFFF;        /* Initialize cluster allocation information */
        fs->fsi_flag = 0x80;
#if (_FS_NOFSINFO & 3) != 3
        if (fmt == FS_FAT32                /* Enable FSINFO only if FAT32 and BPB_FSInfo32 == 1 */
            && ld_word(fs->win + BPB_FSInfo32) == 1
            && move_window(fs, bsect + 1) == FR_OK) {
            fs->fsi_flag = 0;
            if (ld_word(fs->win + BS_55AA) == 0xAA55    /* Load FSINFO data if available */
                && ld_dword(fs->win + FSI_LeadSig) == 0x41615252
                && ld_dword(fs->win + FSI_StrucSig) == 0x61417272) {
#if (_FS_NOFSINFO & 1) == 0
                fs->free_clst = ld_dword(fs->win + FSI_Free_Count);
#endif
#if (_FS_NOFSINFO & 2) == 0
                fs->last_clst = ld_dword(fs->win + FSI_Nxt_Free);
#endif
            }
        }
#endif    /* (_FS_NOFSINFO & 3) != 3 */
#endif    /* !_FS_READONLY */
    }

    fs->fs_type = fmt;        /* FAT sub-type */
    fs->id = ++Fsid;        /* File system mount ID */
#if _USE_LFN == 1
                                                                                                                            fs->lfnbuf = LfnBuf;	/* Static LFN working buffer */
#if _FS_EXFAT
	fs->dirbuf = DirBuf;	/* Static directory block scratchpad buuffer */
#endif
#endif
#if _FS_RPATH != 0
    fs->cdir = 0;			/* Initialize current directory */
#endif
#if _FS_LOCK != 0            /* Clear file lock semaphores */
    clear_lock(fs);
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/directory object is valid or not                    */
/*-----------------------------------------------------------------------*/

static
FRESULT validate(    /* Returns FR_OK or FR_INVALID_OBJECT */
        _FDID *obj,        /* Pointer to the _OBJ, the 1st member in the FIL/DIR object, to check validity */
        FATFS **fs        /* Pointer to pointer to the owner file system object to return */
) {
    FRESULT res = FR_INVALID_OBJECT;

    if (obj && obj->fs && obj->fs->fs_type && obj->id == obj->fs->id) {    /* Test if the object is valid */
#if _FS_REENTRANT
        if (lock_fs(obj->fs)) {    /* Obtain the filesystem object */
            if (!(disk_status(obj->fs->drv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
                res = FR_OK;
            } else {
                unlock_fs(obj->fs, FR_OK);
            }
        } else {
            res = FR_TIMEOUT;
        }
#else
                                                                                                                                if (!(disk_status(obj->fs->drv) & STA_NOINIT)) { /* Test if the phsical drive is kept initialized */
		res = FR_OK;			/* Valid object */
		}
#endif
    }
    *fs = (res == FR_OK) ? obj->fs : 0;    /* Corresponding filesystem object */
    return res;
}




/*---------------------------------------------------------------------------

   Public Functions (FatFs API)

----------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount(
        FATFS *fs,            /* Pointer to the file system object (NULL:unmount)*/
        const TCHAR *path,    /* Logical drive number to be mounted/unmounted */
        BYTE opt            /* Mode option 0:Do not mount (delayed mount), 1:Mount immediately */
) {
    FATFS *cfs;
    int vol;
    FRESULT res;
    const TCHAR *rp = path;


    /* Get logical drive number */
    vol = get_ldnumber(&rp);
    if (vol < 0) return FR_INVALID_DRIVE;
    cfs = FatFs[vol];                    /* Pointer to fs object */

    if (cfs) {
#if _FS_LOCK != 0
        clear_lock(cfs);
#endif
#if _FS_REENTRANT                        /* Discard sync object of the current volume */
        if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
#endif
        cfs->fs_type = 0;                /* Clear old fs object */
    }

    if (fs) {
        fs->fs_type = 0;                /* Clear new fs object */
#if _FS_REENTRANT                        /* Create sync object for the new volume */
        if (!ff_cre_syncobj((BYTE) vol, &fs->sobj)) return FR_INT_ERR;
#endif
    }
    FatFs[vol] = fs;                    /* Register new fs object */

    if (!fs || opt != 1) return FR_OK;    /* Do not mount now, it will be mounted later */

    res = find_volume(&path, &fs, 0);    /* Force mounted the volume */
    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open(
        FIL *fp,            /* Pointer to the blank file object */
        const TCHAR *path,    /* Pointer to the file name */
        BYTE mode            /* Access mode and file open mode flags */
) {
    FRESULT res;
    DIR dj;
    FATFS *fs;
#if !_FS_READONLY
    DWORD dw, cl, bcs, clst, sc;
    FSIZE_t ofs;
#endif
    DEF_NAMBUF


    if (!fp) return FR_INVALID_OBJECT;

    /* Get logical drive */
    mode &= _FS_READONLY ? FA_READ : FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_CREATE_NEW | FA_OPEN_ALWAYS |
                                     FA_OPEN_APPEND | FA_SEEKEND;
    res = find_volume(&path, &fs, mode);
    if (res == FR_OK) {
        dj.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);    /* Follow the file path */
#if !_FS_READONLY    /* R/W configuration */
        if (res == FR_OK) {
            if (dj.fn[NSFLAG] & NS_NONAME) {    /* Origin directory itself? */
                res = FR_INVALID_NAME;
            }
#if _FS_LOCK != 0
            else {
                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
            }
#endif
        }
        /* Create or Open a file */
        if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
            if (res != FR_OK) {                    /* No file, create new */
                if (res == FR_NO_FILE) {        /* There is no file to open, create a new entry */
#if _FS_LOCK != 0
                    res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
                    res = dir_register(&dj);
#endif
                }
                mode |= FA_CREATE_ALWAYS;        /* File is created */
            } else {                                /* Any object is already existing */
                if (dj.obj.attr & (AM_RDO | AM_DIR)) {    /* Cannot overwrite it (R/O or DIR) */
                    res = FR_DENIED;
                } else {
                    if (mode & FA_CREATE_NEW) res = FR_EXIST;    /* Cannot create as new file */
                }
            }
            if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {    /* Truncate it if overwrite mode */
                dw = GET_FATTIME();
#if _FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {
                    /* Get current allocation info */
                    fp->obj.fs = fs;
                    fp->obj.sclust = ld_dword(fs->dirbuf + XDIR_FstClus);
                    fp->obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                    fp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
                    fp->obj.n_frag = 0;
                    /* Initialize directory entry block */
                    st_dword(fs->dirbuf + XDIR_CrtTime, dw);    /* Set created time */
                    fs->dirbuf[XDIR_CrtTime10] = 0;
                    st_dword(fs->dirbuf + XDIR_ModTime, dw);    /* Set modified time */
                    fs->dirbuf[XDIR_ModTime10] = 0;
                    fs->dirbuf[XDIR_Attr] = AM_ARC;                /* Reset attribute */
                    st_dword(fs->dirbuf + XDIR_FstClus, 0);        /* Reset file allocation info */
                    st_qword(fs->dirbuf + XDIR_FileSize, 0);
                    st_qword(fs->dirbuf + XDIR_ValidFileSize, 0);
                    fs->dirbuf[XDIR_GenFlags] = 1;
                    res = store_xdir(&dj);
                    if (res == FR_OK && fp->obj.sclust) {        /* Remove the cluster chain if exist */
                        res = remove_chain(&fp->obj, fp->obj.sclust, 0);
                        fs->last_clst = fp->obj.sclust - 1;        /* Reuse the cluster hole */
                    }
                } else
#endif
                {
                    /* Clean directory info */
                    st_dword(dj.dir + DIR_CrtTime, dw);    /* Set created time */
                    st_dword(dj.dir + DIR_ModTime, dw);    /* Set modified time */
                    dj.dir[DIR_Attr] = AM_ARC;            /* Reset attribute */
                    cl = ld_clust(fs, dj.dir);            /* Get cluster chain */
                    st_clust(fs, dj.dir, 0);            /* Reset file allocation info */
                    st_dword(dj.dir + DIR_FileSize, 0);
                    fs->wflag = 1;

                    if (cl) {                            /* Remove the cluster chain if exist */
                        dw = fs->winsect;
                        res = remove_chain(&dj.obj, cl, 0);
                        if (res == FR_OK) {
                            res = move_window(fs, dw);
                            fs->last_clst = cl - 1;        /* Reuse the cluster hole */
                        }
                    }
                }
            }
        } else {    /* Open an existing file */
            if (res == FR_OK) {                    /* Following succeeded */
                if (dj.obj.attr & AM_DIR) {        /* It is a directory */
                    res = FR_NO_FILE;
                } else {
                    if ((mode & FA_WRITE) && (dj.obj.attr & AM_RDO)) { /* R/O violation */
                        res = FR_DENIED;
                    }
                }
            }
        }
        if (res == FR_OK) {
            if (mode & FA_CREATE_ALWAYS)        /* Set file change flag if created or overwritten */
                mode |= FA_MODIFIED;
            fp->dir_sect = fs->winsect;            /* Pointer to the directory entry */
            fp->dir_ptr = dj.dir;
#if _FS_LOCK != 0
            fp->obj.lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
            if (!fp->obj.lockid) res = FR_INT_ERR;
#endif
        }
#else		/* R/O configuration */
                                                                                                                                if (res == FR_OK) {
			if (dj.fn[NSFLAG] & NS_NONAME) {	/* Origin directory itself? */
				res = FR_INVALID_NAME;
			} else {
				if (dj.obj.attr & AM_DIR) {		/* It is a directory */
					res = FR_NO_FILE;
				}
			}
		}
#endif

        if (res == FR_OK) {
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                fp->obj.c_scl = dj.obj.sclust;                            /* Get containing directory info */
                fp->obj.c_size = ((DWORD) dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
                fp->obj.c_ofs = dj.blk_ofs;
                fp->obj.sclust = ld_dword(fs->dirbuf + XDIR_FstClus);    /* Get object allocation info */
                fp->obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                fp->obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
            } else
#endif
            {
                fp->obj.sclust = ld_clust(fs, dj.dir);                    /* Get object allocation info */
                fp->obj.objsize = ld_dword(dj.dir + DIR_FileSize);
            }
#if _USE_FASTSEEK
            fp->cltbl = 0;            /* Disable fast seek mode */
#endif
            fp->obj.fs = fs;        /* Validate the file object */
            fp->obj.id = fs->id;
            fp->flag = mode;        /* Set file access mode */
            fp->err = 0;            /* Clear error flag */
            fp->sect = 0;            /* Invalidate current data sector */
            fp->fptr = 0;            /* Set file pointer top of the file */
#if !_FS_READONLY
#if !_FS_TINY
            mem_set(fp->buf, 0, _MAX_SS);    /* Clear sector buffer */
#endif
            if ((mode & FA_SEEKEND) &&
                fp->obj.objsize > 0) {    /* Seek to end of file if FA_OPEN_APPEND is specified */
                fp->fptr = fp->obj.objsize;            /* Offset to seek */
                bcs = (DWORD) fs->csize * SS(fs);    /* Cluster size in byte */
                clst = fp->obj.sclust;                /* Follow the cluster chain */
                for (ofs = fp->obj.objsize; res == FR_OK && ofs > bcs; ofs -= bcs) {
                    clst = get_fat(&fp->obj, clst);
                    if (clst <= 1) res = FR_INT_ERR;
                    if (clst == 0xFFFFFFFF) res = FR_DISK_ERR;
                }
                fp->clust = clst;
                if (res == FR_OK && ofs % SS(fs)) {    /* Fill sector buffer if not on the sector boundary */
                    if ((sc = clust2sect(fs, clst)) == 0) {
                        res = FR_INT_ERR;
                    } else {
                        fp->sect = sc + (DWORD) (ofs / SS(fs));
#if !_FS_TINY
                        if (disk_read(fs->drv, fp->buf, fp->sect, 1) != RES_OK) res = FR_DISK_ERR;
#endif
                    }
                }
            }
#endif
        }

        FREE_NAMBUF();
    }

    if (res != FR_OK) fp->obj.fs = 0;    /* Invalidate file object on error */

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read(
        FIL *fp,    /* Pointer to the file object */
        void *buff,    /* Pointer to data buffer */
        UINT btr,    /* Number of bytes to read */
        UINT *br    /* Pointer to number of bytes read */
) {
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    FSIZE_t remain;
    UINT rcnt, cc, csect;
    BYTE *rbuff = (BYTE *) buff;


    *br = 0;    /* Clear read byte counter */
    res = validate(&fp->obj, &fs);                /* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT) fp->err) != FR_OK) LEAVE_FF(fs, res);    /* Check validity */
    if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED); /* Check access mode */
    remain = fp->obj.objsize - fp->fptr;
    if (btr > remain) btr = (UINT) remain;        /* Truncate btr by remaining bytes */

    for (; btr;                                /* Repeat until all data read */
           rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
        if (fp->fptr % SS(fs) == 0) {            /* On the sector boundary? */
            csect = (UINT) (fp->fptr / SS(fs) & (fs->csize - 1));    /* Sector offset in the cluster */
            if (csect == 0) {                    /* On the cluster boundary? */
                if (fp->fptr == 0) {            /* On the top of the file? */
                    clst = fp->obj.sclust;        /* Follow cluster chain from the origin */
                } else {                        /* Middle or end of the file */
#if _USE_FASTSEEK
                    if (fp->cltbl) {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    } else
#endif
                    {
                        clst = get_fat(&fp->obj, fp->clust);    /* Follow cluster chain on the FAT */
                    }
                }
                if (clst < 2) ABORT(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->clust = clst;                /* Update current cluster */
            }
            sect = clust2sect(fs, fp->clust);    /* Get current sector */
            if (!sect) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btr / SS(fs);                    /* When remaining bytes >= sector size, */
            if (cc) {                            /* Read maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {    /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_read(fs->drv, rbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if !_FS_READONLY && _FS_MINIMIZE <= 2            /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY
                                                                                                                                        if (fs->wflag && fs->winsect - sect < cc) {
					mem_cpy(rbuff + ((fs->winsect - sect) * SS(fs)), fs->win, SS(fs));
				}
#else
                if ((fp->flag & FA_DIRTY) && fp->sect - sect < cc) {
                    mem_cpy(rbuff + ((fp->sect - sect) * SS(fs)), fp->buf, SS(fs));
                }
#endif
#endif
                rcnt = SS(fs) * cc;                /* Number of bytes transferred */
                continue;
            }
#if !_FS_TINY
            if (fp->sect != sect) {            /* Load data sector if not in cache */
#if !_FS_READONLY
                if (fp->flag & FA_DIRTY) {        /* Write-back dirty sector cache */
                    if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                    fp->flag &= (BYTE) ~FA_DIRTY;
                }
#endif
                if (disk_read(fs->drv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);    /* Fill sector cache */
            }
#endif
            fp->sect = sect;
        }
        rcnt = SS(fs) - (UINT) fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if (rcnt > btr) rcnt = btr;                    /* Clip it by btr if needed */
#if _FS_TINY
                                                                                                                                if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
		mem_cpy(rbuff, fs->win + fp->fptr % SS(fs), rcnt);	/* Extract partial sector */
#else
        mem_cpy(rbuff, fp->buf + fp->fptr % SS(fs), rcnt);    /* Extract partial sector */
#endif
    }

    LEAVE_FF(fs, FR_OK);
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write(
        FIL *fp,            /* Pointer to the file object */
        const void *buff,    /* Pointer to the data to be written */
        UINT btw,            /* Number of bytes to write */
        UINT *bw            /* Pointer to number of bytes written */
) {
    FRESULT res;
    FATFS *fs;
    DWORD clst, sect;
    UINT wcnt, cc, csect;
    const BYTE *wbuff = (const BYTE *) buff;


    *bw = 0;    /* Clear write byte counter */
    res = validate(&fp->obj, &fs);            /* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT) fp->err) != FR_OK) LEAVE_FF(fs, res);    /* Check validity */
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);    /* Check access mode */

    /* Check fptr wrap-around (file size cannot reach 4GiB on FATxx) */
    if ((!_FS_EXFAT || fs->fs_type != FS_EXFAT) && (DWORD) (fp->fptr + btw) < (DWORD) fp->fptr) {
        btw = (UINT) (0xFFFFFFFF - (DWORD) fp->fptr);
    }

    for (; btw;                            /* Repeat until all data written */
           wbuff += wcnt, fp->fptr += wcnt, fp->obj.objsize = (fp->fptr > fp->obj.objsize) ? fp->fptr
                                                                                           : fp->obj.objsize, *bw += wcnt, btw -= wcnt) {
        if (fp->fptr % SS(fs) == 0) {        /* On the sector boundary? */
            csect = (UINT) (fp->fptr / SS(fs)) & (fs->csize - 1);    /* Sector offset in the cluster */
            if (csect == 0) {                /* On the cluster boundary? */
                if (fp->fptr == 0) {        /* On the top of the file? */
                    clst = fp->obj.sclust;    /* Follow from the origin */
                    if (clst == 0) {        /* If no cluster is allocated, */
                        clst = create_chain(&fp->obj, 0);    /* create a new cluster chain */
                    }
                } else {                    /* On the middle or end of the file */
#if _USE_FASTSEEK
                    if (fp->cltbl) {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    } else
#endif
                    {
                        clst = create_chain(&fp->obj, fp->clust);    /* Follow or stretch cluster chain on the FAT */
                    }
                }
                if (clst == 0) break;        /* Could not allocate a new cluster (disk full) */
                if (clst == 1) ABORT(fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                fp->clust = clst;            /* Update current cluster */
                if (fp->obj.sclust == 0) fp->obj.sclust = clst;    /* Set start cluster if the first write */
            }
#if _FS_TINY
            if (fs->winsect == fp->sect && sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Write-back sector cache */
#else
            if (fp->flag & FA_DIRTY) {        /* Write-back sector cache */
                if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE) ~FA_DIRTY;
            }
#endif
            sect = clust2sect(fs, fp->clust);    /* Get current sector */
            if (!sect) ABORT(fs, FR_INT_ERR);
            sect += csect;
            cc = btw / SS(fs);                /* When remaining bytes >= sector size, */
            if (cc) {                        /* Write maximum contiguous sectors directly */
                if (csect + cc > fs->csize) {    /* Clip at cluster boundary */
                    cc = fs->csize - csect;
                }
                if (disk_write(fs->drv, wbuff, sect, cc) != RES_OK) ABORT(fs, FR_DISK_ERR);
#if _FS_MINIMIZE <= 2
#if _FS_TINY
                                                                                                                                        if (fs->winsect - sect < cc) {	/* Refill sector cache if it gets invalidated by the direct write */
					mem_cpy(fs->win, wbuff + ((fs->winsect - sect) * SS(fs)), SS(fs));
					fs->wflag = 0;
				}
#else
                if (fp->sect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fp->buf, wbuff + ((fp->sect - sect) * SS(fs)), SS(fs));
                    fp->flag &= (BYTE) ~FA_DIRTY;
                }
#endif
#endif
                wcnt = SS(fs) * cc;        /* Number of bytes transferred */
                continue;
            }
#if _FS_TINY
                                                                                                                                    if (fp->fptr >= fp->obj.objsize) {	/* Avoid silly cache filling on the growing edge */
				if (sync_window(fs) != FR_OK) ABORT(fs, FR_DISK_ERR);
				fs->winsect = sect;
			}
#else
            if (fp->sect != sect &&        /* Fill sector cache with file data */
                fp->fptr < fp->obj.objsize &&
                disk_read(fs->drv, fp->buf, sect, 1) != RES_OK) {
                ABORT(fs, FR_DISK_ERR);
            }
#endif
            fp->sect = sect;
        }
        wcnt = SS(fs) - (UINT) fp->fptr % SS(fs);    /* Number of bytes left in the sector */
        if (wcnt > btw) wcnt = btw;                    /* Clip it by btw if needed */
#if _FS_TINY
                                                                                                                                if (move_window(fs, fp->sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window */
		mem_cpy(fs->win + fp->fptr % SS(fs), wbuff, wcnt);	/* Fit data to the sector */
		fs->wflag = 1;
#else
        mem_cpy(fp->buf + fp->fptr % SS(fs), wbuff, wcnt);    /* Fit data to the sector */
        fp->flag |= FA_DIRTY;
#endif
    }

    fp->flag |= FA_MODIFIED;                /* Set file change flag */

    LEAVE_FF(fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File                                                  */
/*-----------------------------------------------------------------------*/

FRESULT f_sync(
        FIL *fp        /* Pointer to the file object */
) {
    FRESULT res;
    FATFS *fs;
    DWORD tm;
    BYTE *dir;
#if _FS_EXFAT
    DIR dj;
    DEF_NAMBUF
#endif

    res = validate(&fp->obj, &fs);    /* Check validity of the file object */
    if (res == FR_OK) {
        if (fp->flag & FA_MODIFIED) {    /* Is there any change to the file? */
#if !_FS_TINY
            if (fp->flag & FA_DIRTY) {    /* Write-back cached data if needed */
                if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) LEAVE_FF(fs, FR_DISK_ERR);
                fp->flag &= (BYTE) ~FA_DIRTY;
            }
#endif
            /* Update the directory entry */
            tm = GET_FATTIME();                /* Modified time */
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {
                res = fill_first_frag(&fp->obj);    /* Fill first fragment on the FAT if needed */
                if (res == FR_OK) {
                    res = fill_last_frag(&fp->obj, fp->clust,
                                         0xFFFFFFFF);    /* Fill last fragment on the FAT if needed */
                }
                if (res == FR_OK) {
                    INIT_NAMBUF(fs);
                    res = load_obj_dir(&dj, &fp->obj);    /* Load directory entry block */
                    if (res == FR_OK) {
                        fs->dirbuf[XDIR_Attr] |= AM_ARC;                /* Set archive bit */
                        fs->dirbuf[XDIR_GenFlags] = fp->obj.stat | 1;    /* Update file allocation info */
                        st_dword(fs->dirbuf + XDIR_FstClus, fp->obj.sclust);
                        st_qword(fs->dirbuf + XDIR_FileSize, fp->obj.objsize);
                        st_qword(fs->dirbuf + XDIR_ValidFileSize, fp->obj.objsize);
                        st_dword(fs->dirbuf + XDIR_ModTime, tm);        /* Update modified time */
                        fs->dirbuf[XDIR_ModTime10] = 0;
                        st_dword(fs->dirbuf + XDIR_AccTime, 0);
                        res = store_xdir(&dj);    /* Restore it to the directory */
                        if (res == FR_OK) {
                            res = sync_fs(fs);
                            fp->flag &= (BYTE) ~FA_MODIFIED;
                        }
                    }
                    FREE_NAMBUF();
                }
            } else
#endif
            {
                res = move_window(fs, fp->dir_sect);
                if (res == FR_OK) {
                    dir = fp->dir_ptr;
                    dir[DIR_Attr] |= AM_ARC;                        /* Set archive bit */
                    st_clust(fp->obj.fs, dir, fp->obj.sclust);        /* Update file allocation info  */
                    st_dword(dir + DIR_FileSize, (DWORD) fp->obj.objsize);    /* Update file size */
                    st_dword(dir + DIR_ModTime, tm);                /* Update modified time */
                    st_word(dir + DIR_LstAccDate, 0);
                    fs->wflag = 1;
                    res = sync_fs(fs);                    /* Restore it to the directory */
                    fp->flag &= (BYTE) ~FA_MODIFIED;
                }
            }
        }
    }

    LEAVE_FF(fs, res);
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close(
        FIL *fp        /* Pointer to the file object to be closed */
) {
    FRESULT res;
    FATFS *fs;

#if !_FS_READONLY
    res = f_sync(fp);                    /* Flush cached data */
    if (res == FR_OK)
#endif
    {
        res = validate(&fp->obj, &fs);    /* Lock volume */
        if (res == FR_OK) {
#if _FS_LOCK != 0
            res = dec_lock(fp->obj.lockid);    /* Decrement file open counter */
            if (res == FR_OK)
#endif
            {
                fp->obj.fs = 0;            /* Invalidate file object */
            }
#if _FS_REENTRANT
            unlock_fs(fs, FR_OK);        /* Unlock volume */
#endif
        }
    }
    return res;
}


#if _FS_RPATH >= 1
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

#if _VOLUMES >= 2
FRESULT f_chdrive (
	const TCHAR* path		/* Drive number */
)
{
	int vol;


	/* Get logical drive number */
	vol = get_ldnumber(&path);
	if (vol < 0) return FR_INVALID_DRIVE;

	CurrVol = (BYTE)vol;	/* Set it as current volume */

	return FR_OK;
}
#endif


FRESULT f_chdir (
	const TCHAR* path	/* Pointer to the directory path */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	DEF_NAMBUF

	/* Get logical drive */
	res = find_volume(&path, &fs, 0);
	if (res == FR_OK) {
		dj.obj.fs = fs;
		INIT_NAMBUF(fs);
		res = follow_path(&dj, path);		/* Follow the path */
		if (res == FR_OK) {					/* Follow completed */
			if (dj.fn[NSFLAG] & NS_NONAME) {
				fs->cdir = dj.obj.sclust;	/* It is the start directory itself */
#if _FS_EXFAT
				if (fs->fs_type == FS_EXFAT) {
					fs->cdc_scl = dj.obj.c_scl;
					fs->cdc_size = dj.obj.c_size;
					fs->cdc_ofs = dj.obj.c_ofs;
				}
#endif
			} else {
				if (dj.obj.attr & AM_DIR) {	/* It is a sub-directory */
#if _FS_EXFAT
					if (fs->fs_type == FS_EXFAT) {
						fs->cdir = ld_dword(fs->dirbuf + XDIR_FstClus);		/* Sub-directory cluster */
						fs->cdc_scl = dj.obj.sclust;						/* Save containing directory information */
						fs->cdc_size = ((DWORD)dj.obj.objsize & 0xFFFFFF00) | dj.obj.stat;
						fs->cdc_ofs = dj.blk_ofs;
					} else
#endif
					{
						fs->cdir = ld_clust(fs, dj.dir);					/* Sub-directory cluster */
					}
				} else {
					res = FR_NO_PATH;		/* Reached but a file */
				}
			}
		}
		FREE_NAMBUF();
		if (res == FR_NO_FILE) res = FR_NO_PATH;
	}

	LEAVE_FF(fs, res);
}


#if _FS_RPATH >= 2
FRESULT f_getcwd (
	TCHAR* buff,	/* Pointer to the directory path */
	UINT len		/* Size of path */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	UINT i, n;
	DWORD ccl;
	TCHAR *tp;
	FILINFO fno;
	DEF_NAMBUF


	*buff = 0;
	/* Get logical drive */
	res = find_volume((const TCHAR**)&buff, &fs, 0);	/* Get current volume */
	if (res == FR_OK) {
		dj.obj.fs = fs;
		INIT_NAMBUF(fs);
		i = len;			/* Bottom of buffer (directory stack base) */
		if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {	/* (Cannot do getcwd on exFAT and returns root path) */
			dj.obj.sclust = fs->cdir;				/* Start to follow upper directory from current directory */
			while ((ccl = dj.obj.sclust) != 0) {	/* Repeat while current directory is a sub-directory */
				res = dir_sdi(&dj, 1 * SZDIRE);	/* Get parent directory */
				if (res != FR_OK) break;
				res = move_window(fs, dj.sect);
				if (res != FR_OK) break;
				dj.obj.sclust = ld_clust(fs, dj.dir);	/* Goto parent directory */
				res = dir_sdi(&dj, 0);
				if (res != FR_OK) break;
				do {							/* Find the entry links to the child directory */
					res = dir_read(&dj, 0);
					if (res != FR_OK) break;
					if (ccl == ld_clust(fs, dj.dir)) break;	/* Found the entry */
					res = dir_next(&dj, 0);
				} while (res == FR_OK);
				if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
				if (res != FR_OK) break;
				get_fileinfo(&dj, &fno);		/* Get the directory name and push it to the buffer */
				for (n = 0; fno.fname[n]; n++) ;
				if (i < n + 3) {
					res = FR_NOT_ENOUGH_CORE; break;
				}
				while (n) buff[--i] = fno.fname[--n];
				buff[--i] = '/';
			}
		}
		tp = buff;
		if (res == FR_OK) {
#if _VOLUMES >= 2
			*tp++ = '0' + CurrVol;			/* Put drive number */
			*tp++ = ':';
#endif
			if (i == len) {					/* Root-directory */
				*tp++ = '/';
			} else {						/* Sub-directroy */
				do		/* Add stacked path str */
					*tp++ = buff[i++];
				while (i < len);
			}
		}
		*tp = 0;
		FREE_NAMBUF();
	}

	LEAVE_FF(fs, res);
}

#endif /* _FS_RPATH >= 2 */
#endif /* _FS_RPATH >= 1 */


#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek(
        FIL *fp,        /* Pointer to the file object */
        FSIZE_t ofs        /* File pointer from top of file */
) {
    FRESULT res;
    FATFS *fs;
    DWORD clst, bcs, nsect;
    FSIZE_t ifptr;
#if _USE_FASTSEEK
    DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
#endif

    res = validate(&fp->obj, &fs);        /* Check validity of the file object */
    if (res == FR_OK) res = (FRESULT) fp->err;
#if _FS_EXFAT && !_FS_READONLY
    if (res == FR_OK && fs->fs_type == FS_EXFAT) {
        res = fill_last_frag(&fp->obj, fp->clust, 0xFFFFFFFF);    /* Fill last fragment on the FAT if needed */
    }
#endif
    if (res != FR_OK) LEAVE_FF(fs, res);

#if _USE_FASTSEEK
    if (fp->cltbl) {    /* Fast seek */
        if (ofs == CREATE_LINKMAP) {    /* Create CLMT */
            tbl = fp->cltbl;
            tlen = *tbl++;
            ulen = 2;    /* Given table size and required table size */
            cl = fp->obj.sclust;        /* Origin of the chain */
            if (cl) {
                do {
                    /* Get a fragment */
                    tcl = cl;
                    ncl = 0;
                    ulen += 2;    /* Top, length and used items */
                    do {
                        pcl = cl;
                        ncl++;
                        cl = get_fat(&fp->obj, cl);
                        if (cl <= 1) ABORT(fs, FR_INT_ERR);
                        if (cl == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    } while (cl == pcl + 1);
                    if (ulen <= tlen) {        /* Store the length and top of the fragment */
                        *tbl++ = ncl;
                        *tbl++ = tcl;
                    }
                } while (cl < fs->n_fatent);    /* Repeat until end of chain */
            }
            *fp->cltbl = ulen;    /* Number of items used */
            if (ulen <= tlen) {
                *tbl = 0;        /* Terminate table */
            } else {
                res = FR_NOT_ENOUGH_CORE;    /* Given table size is smaller than required */
            }
        } else {                        /* Fast seek */
            if (ofs > fp->obj.objsize) ofs = fp->obj.objsize;    /* Clip offset at the file size */
            fp->fptr = ofs;                /* Set file pointer */
            if (ofs) {
                fp->clust = clmt_clust(fp, ofs - 1);
                dsc = clust2sect(fs, fp->clust);
                if (!dsc) ABORT(fs, FR_INT_ERR);
                dsc += (DWORD) ((ofs - 1) / SS(fs)) & (fs->csize - 1);
                if (fp->fptr % SS(fs) && dsc != fp->sect) {    /* Refill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
                    if (fp->flag & FA_DIRTY) {        /* Write-back dirty sector cache */
                        if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                        fp->flag &= (BYTE) ~FA_DIRTY;
                    }
#endif
                    if (disk_read(fs->drv, fp->buf, dsc, 1) != RES_OK) ABORT(fs,
                                                                             FR_DISK_ERR);    /* Load current sector */
#endif
                    fp->sect = dsc;
                }
            }
        }
    } else
#endif

        /* Normal Seek */
    {
#if _FS_EXFAT
        if (fs->fs_type != FS_EXFAT && ofs >= 0x100000000) ofs = 0xFFFFFFFF;    /* Clip at 4GiB-1 if at FATxx */
#endif
        if (ofs > fp->obj.objsize &&
            (_FS_READONLY || !(fp->flag & FA_WRITE))) {    /* In read-only mode, clip offset with the file size */
            ofs = fp->obj.objsize;
        }
        ifptr = fp->fptr;
        fp->fptr = nsect = 0;
        if (ofs) {
            bcs = (DWORD) fs->csize * SS(fs);    /* Cluster size (byte) */
            if (ifptr > 0 &&
                (ofs - 1) / bcs >= (ifptr - 1) / bcs) {    /* When seek to same or following cluster, */
                fp->fptr = (ifptr - 1) & ~(FSIZE_t) (bcs - 1);    /* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->clust;
            } else {                                    /* When seek to back cluster, */
                clst = fp->obj.sclust;                    /* start from the first cluster */
#if !_FS_READONLY
                if (clst == 0) {                        /* If no cluster chain, create a new chain */
                    clst = create_chain(&fp->obj, 0);
                    if (clst == 1) ABORT(fs, FR_INT_ERR);
                    if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    fp->obj.sclust = clst;
                }
#endif
                fp->clust = clst;
            }
            if (clst != 0) {
                while (ofs > bcs) {                        /* Cluster following loop */
                    ofs -= bcs;
                    fp->fptr += bcs;
#if !_FS_READONLY
                    if (fp->flag & FA_WRITE) {            /* Check if in write mode or not */
                        if (_FS_EXFAT && fp->fptr >
                                         fp->obj.objsize) {    /* No FAT chain object needs correct objsize to generate FAT value */
                            fp->obj.objsize = fp->fptr;
                            fp->flag |= FA_MODIFIED;
                        }
                        clst = create_chain(&fp->obj, clst);    /* Follow chain with forceed stretch */
                        if (clst == 0) {                /* Clip file size in case of disk full */
                            ofs = 0;
                            break;
                        }
                    } else
#endif
                    {
                        clst = get_fat(&fp->obj, clst);    /* Follow cluster chain if not in write mode */
                    }
                    if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
                    if (clst <= 1 || clst >= fs->n_fatent) ABORT(fs, FR_INT_ERR);
                    fp->clust = clst;
                }
                fp->fptr += ofs;
                if (ofs % SS(fs)) {
                    nsect = clust2sect(fs, clst);    /* Current sector */
                    if (!nsect) ABORT(fs, FR_INT_ERR);
                    nsect += (DWORD) (ofs / SS(fs));
                }
            }
        }
        if (!_FS_READONLY &&
            fp->fptr > fp->obj.objsize) {        /* Set file change flag if the file size is extended */
            fp->obj.objsize = fp->fptr;
            fp->flag |= FA_MODIFIED;
        }
        if (fp->fptr % SS(fs) && nsect != fp->sect) {    /* Fill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
            if (fp->flag & FA_DIRTY) {            /* Write-back dirty sector cache */
                if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
                fp->flag &= (BYTE) ~FA_DIRTY;
            }
#endif
            if (disk_read(fs->drv, fp->buf, nsect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);    /* Fill sector cache */
#endif
            fp->sect = nsect;
        }
    }

    LEAVE_FF(fs, res);
}


#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directory Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir(
        DIR *dp,            /* Pointer to directory object to create */
        const TCHAR *path    /* Pointer to the directory path */
) {
    FRESULT res;
    FATFS *fs;
    _FDID *obj;
    DEF_NAMBUF


    if (!dp) return FR_INVALID_OBJECT;

    /* Get logical drive */
    obj = &dp->obj;
    res = find_volume(&path, &fs, 0);
    if (res == FR_OK) {
        obj->fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(dp, path);            /* Follow the path to the directory */
        if (res == FR_OK) {                        /* Follow completed */
            if (!(dp->fn[NSFLAG] & NS_NONAME)) {    /* It is not the origin directory itself */
                if (obj->attr & AM_DIR) {        /* This object is a sub-directory */
#if _FS_EXFAT
                    if (fs->fs_type == FS_EXFAT) {
                        obj->c_scl = obj->sclust;                            /* Get containing directory inforamation */
                        obj->c_size = ((DWORD) obj->objsize & 0xFFFFFF00) | obj->stat;
                        obj->c_ofs = dp->blk_ofs;
                        obj->sclust = ld_dword(fs->dirbuf + XDIR_FstClus);    /* Get object allocation info */
                        obj->objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                        obj->stat = fs->dirbuf[XDIR_GenFlags] & 2;
                    } else
#endif
                    {
                        obj->sclust = ld_clust(fs, dp->dir);    /* Get object allocation info */
                    }
                } else {                        /* This object is a file */
                    res = FR_NO_PATH;
                }
            }
            if (res == FR_OK) {
                obj->id = fs->id;
                res = dir_sdi(dp, 0);            /* Rewind directory */
#if _FS_LOCK != 0
                if (res == FR_OK) {
                    if (obj->sclust) {
                        obj->lockid = inc_lock(dp, 0);    /* Lock the sub directory */
                        if (!obj->lockid) res = FR_TOO_MANY_OPEN_FILES;
                    } else {
                        obj->lockid = 0;    /* Root directory need not to be locked */
                    }
                }
#endif
            }
        }
        FREE_NAMBUF();
        if (res == FR_NO_FILE) res = FR_NO_PATH;
    }
    if (res != FR_OK) obj->fs = 0;        /* Invalidate the directory object if function faild */

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Close Directory                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_closedir(
        DIR *dp        /* Pointer to the directory object to be closed */
) {
    FRESULT res;
    FATFS *fs;


    res = validate(&dp->obj, &fs);            /* Check validity of the file object */
    if (res == FR_OK) {
#if _FS_LOCK != 0
        if (dp->obj.lockid) {                /* Decrement sub-directory open counter */
            res = dec_lock(dp->obj.lockid);
        }
        if (res == FR_OK)
#endif
        {
            dp->obj.fs = 0;            /* Invalidate directory object */
        }
#if _FS_REENTRANT
        unlock_fs(fs, FR_OK);        /* Unlock volume */
#endif
    }
    return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entries in Sequence                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir(
        DIR *dp,            /* Pointer to the open directory object */
        FILINFO *fno        /* Pointer to file information to return */
) {
    FRESULT res;
    FATFS *fs;
    DEF_NAMBUF


    res = validate(&dp->obj, &fs);    /* Check validity of the directory object */
    if (res == FR_OK) {
        if (!fno) {
            res = dir_sdi(dp, 0);            /* Rewind the directory object */
        } else {
            INIT_NAMBUF(fs);
            res = dir_read(dp, 0);            /* Read an item */
            if (res == FR_NO_FILE) res = FR_OK;    /* Ignore end of directory */
            if (res == FR_OK) {                /* A valid entry is found */
                get_fileinfo(dp, fno);        /* Get the object information */
                res = dir_next(dp, 0);        /* Increment index for next */
                if (res == FR_NO_FILE) res = FR_OK;    /* Ignore end of directory now */
            }
            FREE_NAMBUF();
        }
    }
    LEAVE_FF(fs, res);
}


#if _USE_FIND
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Find Next File                                                        */
/*-----------------------------------------------------------------------*/

FRESULT f_findnext (
	DIR* dp,		/* Pointer to the open directory object */
	FILINFO* fno	/* Pointer to the file information structure */
)
{
	FRESULT res;


	for (;;) {
		res = f_readdir(dp, fno);		/* Get a directory item */
		if (res != FR_OK || !fno || !fno->fname[0]) break;	/* Terminate if any error or end of directory */
		if (pattern_matching(dp->pat, fno->fname, 0, 0)) break;		/* Test for the file name */
#if _USE_LFN != 0 && _USE_FIND == 2
		if (pattern_matching(dp->pat, fno->altname, 0, 0)) break;	/* Test for alternative name if exist */
#endif
	}
	return res;
}



/*-----------------------------------------------------------------------*/
/* Find First File                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_findfirst (
	DIR* dp,				/* Pointer to the blank directory object */
	FILINFO* fno,			/* Pointer to the file information structure */
	const TCHAR* path,		/* Pointer to the directory to open */
	const TCHAR* pattern	/* Pointer to the matching pattern */
)
{
	FRESULT res;


	dp->pat = pattern;		/* Save pointer to pattern string */
	res = f_opendir(dp, path);		/* Open the target directory */
	if (res == FR_OK) {
		res = f_findnext(dp, fno);	/* Find the first item */
	}
	return res;
}

#endif    /* _USE_FIND */


#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat(
        const TCHAR *path,    /* Pointer to the file path */
        FILINFO *fno        /* Pointer to file information to return */
) {
    FRESULT res;
    DIR dj;
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &dj.obj.fs, 0);
    if (res == FR_OK) {
        INIT_NAMBUF(dj.obj.fs);
        res = follow_path(&dj, path);    /* Follow the file path */
        if (res == FR_OK) {                /* Follow completed */
            if (dj.fn[NSFLAG] & NS_NONAME) {    /* It is origin directory */
                res = FR_INVALID_NAME;
            } else {                            /* Found an object */
                if (fno) get_fileinfo(&dj, fno);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(dj.obj.fs, res);
}


#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree(
        const TCHAR *path,    /* Path name of the logical drive number */
        DWORD *nclst,        /* Pointer to a variable to return number of free clusters */
        FATFS **fatfs        /* Pointer to return pointer to corresponding file system object */
) {
    FRESULT res;
    FATFS *fs;
    DWORD nfree, clst, sect, stat;
    UINT i;
    BYTE *p;
    _FDID obj;


    /* Get logical drive */
    res = find_volume(&path, &fs, 0);
    if (res == FR_OK) {
        *fatfs = fs;                /* Return ptr to the fs object */
        /* If free_clst is valid, return it without full cluster scan */
        if (fs->free_clst <= fs->n_fatent - 2) {
            *nclst = fs->free_clst;
        } else {
            /* Get number of free clusters */
            nfree = 0;
            if (fs->fs_type == FS_FAT12) {    /* FAT12: Sector unalighed FAT entries */
                clst = 2;
                obj.fs = fs;
                do {
                    stat = get_fat(&obj, clst);
                    if (stat == 0xFFFFFFFF) {
                        res = FR_DISK_ERR;
                        break;
                    }
                    if (stat == 1) {
                        res = FR_INT_ERR;
                        break;
                    }
                    if (stat == 0) nfree++;
                } while (++clst < fs->n_fatent);
            } else {
#if _FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {    /* exFAT: Scan bitmap table */
                    BYTE bm;
                    UINT b;

                    clst = fs->n_fatent - 2;
                    sect = fs->database;
                    i = 0;
                    do {
                        if (i == 0 && (res = move_window(fs, sect++)) != FR_OK) break;
                        for (b = 8, bm = fs->win[i]; b && clst; b--, clst--) {
                            if (!(bm & 1)) nfree++;
                            bm >>= 1;
                        }
                        i = (i + 1) % SS(fs);
                    } while (clst);
                } else
#endif
                {    /* FAT16/32: Sector alighed FAT entries */
                    clst = fs->n_fatent;
                    sect = fs->fatbase;
                    i = 0;
                    p = 0;
                    do {
                        if (i == 0) {
                            res = move_window(fs, sect++);
                            if (res != FR_OK) break;
                            p = fs->win;
                            i = SS(fs);
                        }
                        if (fs->fs_type == FS_FAT16) {
                            if (ld_word(p) == 0) nfree++;
                            p += 2;
                            i -= 2;
                        } else {
                            if ((ld_dword(p) & 0x0FFFFFFF) == 0) nfree++;
                            p += 4;
                            i -= 4;
                        }
                    } while (--clst);
                }
            }
            *nclst = nfree;            /* Return the free clusters */
            fs->free_clst = nfree;    /* Now free_clst is valid */
            fs->fsi_flag |= 1;        /* FSInfo is to be updated */
        }
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate(
        FIL *fp        /* Pointer to the file object */
) {
    FRESULT res;
    FATFS *fs;
    DWORD ncl;


    res = validate(&fp->obj, &fs);    /* Check validity of the file object */
    if (res != FR_OK || (res = (FRESULT) fp->err) != FR_OK) LEAVE_FF(fs, res);
    if (!(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);    /* Check access mode */

    if (fp->fptr < fp->obj.objsize) {    /* Process when fptr is not on the eof */
        if (fp->fptr == 0) {    /* When set file size to zero, remove entire cluster chain */
            res = remove_chain(&fp->obj, fp->obj.sclust, 0);
            fp->obj.sclust = 0;
        } else {                /* When truncate a part of the file, remove remaining clusters */
            ncl = get_fat(&fp->obj, fp->clust);
            res = FR_OK;
            if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
            if (ncl == 1) res = FR_INT_ERR;
            if (res == FR_OK && ncl < fs->n_fatent) {
                res = remove_chain(&fp->obj, ncl, fp->clust);
            }
        }
        fp->obj.objsize = fp->fptr;    /* Set file size to current R/W point */
        fp->flag |= FA_MODIFIED;
#if !_FS_TINY
        if (res == FR_OK && (fp->flag & FA_DIRTY)) {
            if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) {
                res = FR_DISK_ERR;
            } else {
                fp->flag &= (BYTE) ~FA_DIRTY;
            }
        }
#endif
        if (res != FR_OK) ABORT(fs, res);
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File/Directory                                               */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink(
        const TCHAR *path        /* Pointer to the file or directory path */
) {
    FRESULT res;
    DIR dj, sdj;
    DWORD dclst = 0;
    FATFS *fs;
#if _FS_EXFAT
    _FDID obj;
#endif
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &fs, FA_WRITE);
    dj.obj.fs = fs;
    if (res == FR_OK) {
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);        /* Follow the file path */
        if (_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT)) {
            res = FR_INVALID_NAME;            /* Cannot remove dot entry */
        }
#if _FS_LOCK != 0
        if (res == FR_OK) res = chk_lock(&dj, 2);    /* Check if it is an open object */
#endif
        if (res == FR_OK) {                    /* The object is accessible */
            if (dj.fn[NSFLAG] & NS_NONAME) {
                res = FR_INVALID_NAME;        /* Cannot remove the origin directory */
            } else {
                if (dj.obj.attr & AM_RDO) {
                    res = FR_DENIED;        /* Cannot remove R/O object */
                }
            }
            if (res == FR_OK) {
#if _FS_EXFAT
                obj.fs = fs;
                if (fs->fs_type == FS_EXFAT) {
                    obj.sclust = dclst = ld_dword(fs->dirbuf + XDIR_FstClus);
                    obj.objsize = ld_qword(fs->dirbuf + XDIR_FileSize);
                    obj.stat = fs->dirbuf[XDIR_GenFlags] & 2;
                } else
#endif
                {
                    dclst = ld_clust(fs, dj.dir);
                }
                if (dj.obj.attr & AM_DIR) {            /* Is it a sub-directory? */
#if _FS_RPATH != 0
                                                                                                                                            if (dclst == fs->cdir) {		 		/* Is it the current directory? */
						res = FR_DENIED;
					} else
#endif
                    {
                        sdj.obj.fs = fs;                        /* Open the sub-directory */
                        sdj.obj.sclust = dclst;
#if _FS_EXFAT
                        if (fs->fs_type == FS_EXFAT) {
                            sdj.obj.objsize = obj.objsize;
                            sdj.obj.stat = obj.stat;
                        }
#endif
                        res = dir_sdi(&sdj, 0);
                        if (res == FR_OK) {
                            res = dir_read(&sdj, 0);            /* Read an item */
                            if (res == FR_OK) res = FR_DENIED;    /* Not empty? */
                            if (res == FR_NO_FILE) res = FR_OK;    /* Empty? */
                        }
                    }
                }
            }
            if (res == FR_OK) {
                res = dir_remove(&dj);            /* Remove the directory entry */
                if (res == FR_OK && dclst) {    /* Remove the cluster chain if exist */
#if _FS_EXFAT
                    res = remove_chain(&obj, dclst, 0);
#else
                    res = remove_chain(&dj.obj, dclst, 0);
#endif
                }
                if (res == FR_OK) res = sync_fs(fs);
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir(
        const TCHAR *path        /* Pointer to the directory path */
) {
    FRESULT res;
    DIR dj;
    FATFS *fs;
    BYTE *dir;
    UINT n;
    DWORD dsc, dcl, pcl, tm;
    DEF_NAMBUF


    /* Get logical drive */
    res = find_volume(&path, &fs, FA_WRITE);
    dj.obj.fs = fs;
    if (res == FR_OK) {
        INIT_NAMBUF(fs);
        res = follow_path(&dj, path);            /* Follow the file path */
        if (res == FR_OK) res = FR_EXIST;        /* Any object with same name is already existing */
        if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT)) {
            res = FR_INVALID_NAME;
        }
        if (res == FR_NO_FILE) {                /* Can create a new directory */
            dcl = create_chain(&dj.obj, 0);        /* Allocate a cluster for the new directory table */
            dj.obj.objsize = (DWORD) fs->csize * SS(fs);
            res = FR_OK;
            if (dcl == 0) res = FR_DENIED;        /* No space to allocate a new cluster */
            if (dcl == 1) res = FR_INT_ERR;
            if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
            if (res == FR_OK) res = sync_window(fs);    /* Flush FAT */
            tm = GET_FATTIME();
            if (res == FR_OK) {                    /* Initialize the new directory table */
                dsc = clust2sect(fs, dcl);
                dir = fs->win;
                mem_set(dir, 0, SS(fs));
                if (!_FS_EXFAT || fs->fs_type != FS_EXFAT) {
                    mem_set(dir + DIR_Name, ' ', 11);    /* Create "." entry */
                    dir[DIR_Name] = '.';
                    dir[DIR_Attr] = AM_DIR;
                    st_dword(dir + DIR_ModTime, tm);
                    st_clust(fs, dir, dcl);
                    mem_cpy(dir + SZDIRE, dir, SZDIRE);    /* Create ".." entry */
                    dir[SZDIRE + 1] = '.';
                    pcl = dj.obj.sclust;
                    if (fs->fs_type == FS_FAT32 && pcl == fs->dirbase) pcl = 0;
                    st_clust(fs, dir + SZDIRE, pcl);
                }
                for (n = fs->csize; n; n--) {    /* Write dot entries and clear following sectors */
                    fs->winsect = dsc++;
                    fs->wflag = 1;
                    res = sync_window(fs);
                    if (res != FR_OK) break;
                    mem_set(dir, 0, SS(fs));
                }
            }
            if (res == FR_OK) {
                res = dir_register(&dj);    /* Register the object to the directoy */
            }
            if (res == FR_OK) {
#if _FS_EXFAT
                if (fs->fs_type == FS_EXFAT) {    /* Initialize directory entry block */
                    st_dword(fs->dirbuf + XDIR_ModTime, tm);    /* Created time */
                    st_dword(fs->dirbuf + XDIR_FstClus, dcl);    /* Table start cluster */
                    st_dword(fs->dirbuf + XDIR_FileSize, (DWORD) dj.obj.objsize);    /* File size needs to be valid */
                    st_dword(fs->dirbuf + XDIR_ValidFileSize, (DWORD) dj.obj.objsize);
                    fs->dirbuf[XDIR_GenFlags] = 3;                /* Initialize the object flag (contiguous) */
                    fs->dirbuf[XDIR_Attr] = AM_DIR;                /* Attribute */
                    res = store_xdir(&dj);
                } else
#endif
                {
                    dir = dj.dir;
                    st_dword(dir + DIR_ModTime, tm);    /* Created time */
                    st_clust(fs, dir, dcl);                /* Table start cluster */
                    dir[DIR_Attr] = AM_DIR;                /* Attribute */
                    fs->wflag = 1;
                }
                if (res == FR_OK) {
                    res = sync_fs(fs);
                }
            } else {
                remove_chain(&dj.obj, dcl, 0);        /* Could not register, remove cluster chain */
            }
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename a File/Directory                                               */
/*-----------------------------------------------------------------------*/

FRESULT f_rename(
        const TCHAR *path_old,    /* Pointer to the object name to be renamed */
        const TCHAR *path_new    /* Pointer to the new name */
) {
    FRESULT res;
    DIR djo, djn;
    FATFS *fs;
    BYTE buf[_FS_EXFAT ? SZDIRE * 2 : 24], *dir;
    DWORD dw;
    DEF_NAMBUF


    get_ldnumber(&path_new);                        /* Snip drive number of new name off */
    res = find_volume(&path_old, &fs, FA_WRITE);    /* Get logical drive of the old object */
    if (res == FR_OK) {
        djo.obj.fs = fs;
        INIT_NAMBUF(fs);
        res = follow_path(&djo, path_old);        /* Check old object */
        if (res == FR_OK && (djo.fn[NSFLAG] & (NS_DOT | NS_NONAME)))
            res = FR_INVALID_NAME;    /* Check validity of name */
#if _FS_LOCK != 0
        if (res == FR_OK) {
            res = chk_lock(&djo, 2);
        }
#endif
        if (res == FR_OK) {                        /* Object to be renamed is found */
#if _FS_EXFAT
            if (fs->fs_type == FS_EXFAT) {    /* At exFAT */
                BYTE nf, nn;
                WORD nh;

                mem_cpy(buf, fs->dirbuf, SZDIRE * 2);    /* Save 85+C0 entry of old object */
                mem_cpy(&djn, &djo, sizeof djo);
                res = follow_path(&djn, path_new);        /* Make sure if new object name is not in use */
                if (res == FR_OK) {                        /* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if (res == FR_NO_FILE) {                /* It is a valid path and no name collision */
                    res = dir_register(&djn);            /* Register the new entry */
                    if (res == FR_OK) {
                        nf = fs->dirbuf[XDIR_NumSec];
                        nn = fs->dirbuf[XDIR_NumName];
                        nh = ld_word(fs->dirbuf + XDIR_NameHash);
                        mem_cpy(fs->dirbuf, buf, SZDIRE * 2);
                        fs->dirbuf[XDIR_NumSec] = nf;
                        fs->dirbuf[XDIR_NumName] = nn;
                        st_word(fs->dirbuf + XDIR_NameHash, nh);
/* Start of critical section where an interruption can cause a cross-link */
                        res = store_xdir(&djn);
                    }
                }
            } else
#endif
            {    /* At FAT12/FAT16/FAT32 */
                mem_cpy(buf, djo.dir + DIR_Attr, 21);    /* Save information about the object except name */
                mem_cpy(&djn, &djo, sizeof(DIR));        /* Duplicate the directory object */
                res = follow_path(&djn, path_new);        /* Make sure if new object name is not in use */
                if (res == FR_OK) {                        /* Is new name already in use by any other object? */
                    res = (djn.obj.sclust == djo.obj.sclust && djn.dptr == djo.dptr) ? FR_NO_FILE : FR_EXIST;
                }
                if (res == FR_NO_FILE) {                /* It is a valid path and no name collision */
                    res = dir_register(&djn);            /* Register the new entry */
                    if (res == FR_OK) {
                        dir = djn.dir;                    /* Copy information about object except name */
                        mem_cpy(dir + 13, buf + 2, 19);
                        dir[DIR_Attr] = buf[0] | AM_ARC;
                        fs->wflag = 1;
                        if ((dir[DIR_Attr] & AM_DIR) &&
                            djo.obj.sclust != djn.obj.sclust) {    /* Update .. entry in the sub-directory if needed */
                            dw = clust2sect(fs, ld_clust(fs, dir));
                            if (!dw) {
                                res = FR_INT_ERR;
                            } else {
/* Start of critical section where an interruption can cause a cross-link */
                                res = move_window(fs, dw);
                                dir = fs->win + SZDIRE * 1;    /* Ptr to .. entry */
                                if (res == FR_OK && dir[1] == '.') {
                                    st_clust(fs, dir, djn.obj.sclust);
                                    fs->wflag = 1;
                                }
                            }
                        }
                    }
                }
            }
            if (res == FR_OK) {
                res = dir_remove(&djo);        /* Remove old entry */
                if (res == FR_OK) {
                    res = sync_fs(fs);
                }
            }
/* End of the critical section */
        }
        FREE_NAMBUF();
    }

    LEAVE_FF(fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */


#if _USE_CHMOD && !_FS_READONLY
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod (
	const TCHAR* path,	/* Pointer to the file path */
	BYTE attr,			/* Attribute bits */
	BYTE mask			/* Attribute mask to change */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	DEF_NAMBUF


	res = find_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
	dj.obj.fs = fs;
	if (res == FR_OK) {
		INIT_NAMBUF(fs);
		res = follow_path(&dj, path);	/* Follow the file path */
		if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
		if (res == FR_OK) {
			mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;	/* Valid attribute mask */
#if _FS_EXFAT
			if (fs->fs_type == FS_EXFAT) {
				fs->dirbuf[XDIR_Attr] = (attr & mask) | (fs->dirbuf[XDIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
				res = store_xdir(&dj);
			} else
#endif
			{
				dj.dir[DIR_Attr] = (attr & mask) | (dj.dir[DIR_Attr] & (BYTE)~mask);	/* Apply attribute change */
				fs->wflag = 1;
			}
			if (res == FR_OK) {
				res = sync_fs(fs);
			}
		}
		FREE_NAMBUF();
	}

	LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime (
	const TCHAR* path,	/* Pointer to the file/directory name */
	const FILINFO* fno	/* Pointer to the time stamp to be set */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	DEF_NAMBUF


	res = find_volume(&path, &fs, FA_WRITE);	/* Get logical drive */
	dj.obj.fs = fs;
	if (res == FR_OK) {
		INIT_NAMBUF(fs);
		res = follow_path(&dj, path);	/* Follow the file path */
		if (res == FR_OK && (dj.fn[NSFLAG] & (NS_DOT | NS_NONAME))) res = FR_INVALID_NAME;	/* Check object validity */
		if (res == FR_OK) {
#if _FS_EXFAT
			if (fs->fs_type == FS_EXFAT) {
				st_dword(fs->dirbuf + XDIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
				res = store_xdir(&dj);
			} else
#endif
			{
				st_dword(dj.dir + DIR_ModTime, (DWORD)fno->fdate << 16 | fno->ftime);
				fs->wflag = 1;
			}
			if (res == FR_OK) {
				res = sync_fs(fs);
			}
		}
		FREE_NAMBUF();
	}

	LEAVE_FF(fs, res);
}

#endif    /* _USE_CHMOD && !_FS_READONLY */


#if _USE_LABEL
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Get Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel (
	const TCHAR* path,	/* Path name of the logical drive number */
	TCHAR* label,		/* Pointer to a buffer to return the volume label */
	DWORD* vsn			/* Pointer to a variable to return the volume serial number */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	UINT si, di;
#if _LFN_UNICODE || _FS_EXFAT
	WCHAR w;
#endif

	/* Get logical drive */
	res = find_volume(&path, &fs, 0);

	/* Get volume label */
	if (res == FR_OK && label) {
		dj.obj.fs = fs; dj.obj.sclust = 0;	/* Open root directory */
		res = dir_sdi(&dj, 0);
		if (res == FR_OK) {
		 	res = dir_read(&dj, 1);			/* Find a volume label entry */
		 	if (res == FR_OK) {
#if _FS_EXFAT
				if (fs->fs_type == FS_EXFAT) {
					for (si = di = 0; si < dj.dir[XDIR_NumLabel]; si++) {	/* Extract volume label from 83 entry */
						w = ld_word(dj.dir + XDIR_Label + si * 2);
#if _LFN_UNICODE
						label[di++] = w;
#else
						w = ff_convert(w, 0);	/* Unicode -> OEM */
						if (w == 0) w = '?';	/* Replace wrong character */
						if (_DF1S && w >= 0x100) label[di++] = (char)(w >> 8);
						label[di++] = (char)w;
#endif
					}
					label[di] = 0;
				} else
#endif
				{
					si = di = 0;		/* Extract volume label from AM_VOL entry with code comversion */
					do {
#if _LFN_UNICODE
						w = (si < 11) ? dj.dir[si++] : ' ';
						if (IsDBCS1(w) && si < 11 && IsDBCS2(dj.dir[si])) {
							w = w << 8 | dj.dir[si++];
						}
						label[di++] = ff_convert(w, 1);	/* OEM -> Unicode */
#else
						label[di++] = dj.dir[si++];
#endif
					} while (di < 11);
					do {				/* Truncate trailing spaces */
						label[di] = 0;
						if (di == 0) break;
					} while (label[--di] == ' ');
				}
			}
		}
		if (res == FR_NO_FILE) {	/* No label entry and return nul string */
			label[0] = 0;
			res = FR_OK;
		}
	}

	/* Get volume serial number */
	if (res == FR_OK && vsn) {
		res = move_window(fs, fs->volbase);
		if (res == FR_OK) {
			switch (fs->fs_type) {
			case FS_EXFAT:
				di = BPB_VolIDEx; break;

			case FS_FAT32:
				di = BS_VolID32; break;

			default:
				di = BS_VolID;
			}
			*vsn = ld_dword(fs->win + di);
		}
	}

	LEAVE_FF(fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set Volume Label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel (
	const TCHAR* label	/* Pointer to the volume label to set */
)
{
	FRESULT res;
	DIR dj;
	FATFS *fs;
	BYTE dirvn[22];
	UINT i, j, slen;
	WCHAR w;
	static const char badchr[] = "\"*+,.:;<=>\?[]|\x7F";


	/* Get logical drive */
	res = find_volume(&label, &fs, FA_WRITE);
	if (res != FR_OK) LEAVE_FF(fs, res);
	dj.obj.fs = fs;

	/* Get length of given volume label */
	for (slen = 0; (UINT)label[slen] >= ' '; slen++) ;	/* Get name length */

#if _FS_EXFAT
	if (fs->fs_type == FS_EXFAT) {	/* On the exFAT volume */
		for (i = j = 0; i < slen; ) {	/* Create volume label in directory form */
			w = label[i++];
#if !_LFN_UNICODE
			if (IsDBCS1(w)) {
				w = (i < slen && IsDBCS2(label[i])) ? w << 8 | (BYTE)label[i++] : 0;
			}
			w = ff_convert(w, 1);
#endif
			if (w == 0 || chk_chr(badchr, w) || j == 22) {	/* Check validity check validity of the volume label */
				LEAVE_FF(fs, FR_INVALID_NAME);
			}
			st_word(dirvn + j, w); j += 2;
		}
		slen = j;
	} else
#endif
	{	/* On the FAT12/16/32 volume */
		for ( ; slen && label[slen - 1] == ' '; slen--) ;	/* Remove trailing spaces */
		if (slen) {		/* Is there a volume label to be set? */
			dirvn[0] = 0; i = j = 0;	/* Create volume label in directory form */
			do {
#if _LFN_UNICODE
				w = ff_convert(ff_wtoupper(label[i++]), 0);
#else
				w = (BYTE)label[i++];
				if (IsDBCS1(w)) {
					w = (j < 10 && i < slen && IsDBCS2(label[i])) ? w << 8 | (BYTE)label[i++] : 0;
				}
#if _USE_LFN != 0
				w = ff_convert(ff_wtoupper(ff_convert(w, 1)), 0);
#else
				if (IsLower(w)) w -= 0x20;			/* To upper ASCII characters */
#ifdef _EXCVT
				if (w >= 0x80) w = ExCvt[w - 0x80];	/* To upper extended characters (SBCS cfg) */
#else
				if (!_DF1S && w >= 0x80) w = 0;		/* Reject extended characters (ASCII cfg) */
#endif
#endif
#endif
				if (w == 0 || chk_chr(badchr, w) || j >= (UINT)((w >= 0x100) ? 10 : 11)) {	/* Reject invalid characters for volume label */
					LEAVE_FF(fs, FR_INVALID_NAME);
				}
				if (w >= 0x100) dirvn[j++] = (BYTE)(w >> 8);
				dirvn[j++] = (BYTE)w;
			} while (i < slen);
			while (j < 11) dirvn[j++] = ' ';	/* Fill remaining name field */
			if (dirvn[0] == DDEM) LEAVE_FF(fs, FR_INVALID_NAME);	/* Reject illegal name (heading DDEM) */
		}
	}

	/* Set volume label */
	dj.obj.sclust = 0;		/* Open root directory */
	res = dir_sdi(&dj, 0);
	if (res == FR_OK) {
		res = dir_read(&dj, 1);	/* Get volume label entry */
		if (res == FR_OK) {
			if (_FS_EXFAT && fs->fs_type == FS_EXFAT) {
				dj.dir[XDIR_NumLabel] = (BYTE)(slen / 2);	/* Change the volume label */
				mem_cpy(dj.dir + XDIR_Label, dirvn, slen);
			} else {
				if (slen) {
					mem_cpy(dj.dir, dirvn, 11);	/* Change the volume label */
				} else {
					dj.dir[DIR_Name] = DDEM;	/* Remove the volume label */
				}
			}
			fs->wflag = 1;
			res = sync_fs(fs);
		} else {			/* No volume label entry is found or error */
			if (res == FR_NO_FILE) {
				res = FR_OK;
				if (slen) {	/* Create a volume label entry */
					res = dir_alloc(&dj, 1);	/* Allocate an entry */
					if (res == FR_OK) {
						mem_set(dj.dir, 0, SZDIRE);	/* Clear the entry */
						if (_FS_EXFAT && fs->fs_type == FS_EXFAT) {
							dj.dir[XDIR_Type] = 0x83;		/* Create 83 entry */
							dj.dir[XDIR_NumLabel] = (BYTE)(slen / 2);
							mem_cpy(dj.dir + XDIR_Label, dirvn, slen);
						} else {
							dj.dir[DIR_Attr] = AM_VOL;		/* Create volume label entry */
							mem_cpy(dj.dir, dirvn, 11);
						}
						fs->wflag = 1;
						res = sync_fs(fs);
					}
				}
			}
		}
	}

	LEAVE_FF(fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _USE_LABEL */


#if _USE_EXPAND && !_FS_READONLY
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Allocate a Contiguous Blocks to the File                              */
/*-----------------------------------------------------------------------*/

FRESULT f_expand (
	FIL* fp,		/* Pointer to the file object */
	FSIZE_t fsz,	/* File size to be expanded to */
	BYTE opt		/* Operation mode 0:Find and prepare or 1:Find and allocate */
)
{
	FRESULT res;
	FATFS *fs;
	DWORD n, clst, stcl, scl, ncl, tcl, lclst;


	res = validate(&fp->obj, &fs);		/* Check validity of the file object */
	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
	if (fsz == 0 || fp->obj.objsize != 0 || !(fp->flag & FA_WRITE)) LEAVE_FF(fs, FR_DENIED);
#if _FS_EXFAT
	if (fs->fs_type != FS_EXFAT && fsz >= 0x100000000) LEAVE_FF(fs, FR_DENIED);	/* Check if in size limit */
#endif
	n = (DWORD)fs->csize * SS(fs);	/* Cluster size */
	tcl = (DWORD)(fsz / n) + ((fsz & (n - 1)) ? 1 : 0);	/* Number of clusters required */
	stcl = fs->last_clst; lclst = 0;
	if (stcl < 2 || stcl >= fs->n_fatent) stcl = 2;

#if _FS_EXFAT
	if (fs->fs_type == FS_EXFAT) {
		scl = find_bitmap(fs, stcl, tcl);			/* Find a contiguous cluster block */
		if (scl == 0) res = FR_DENIED;				/* No contiguous cluster block was found */
		if (scl == 0xFFFFFFFF) res = FR_DISK_ERR;
		if (res == FR_OK) {	/* A contiguous free area is found */
			if (opt) {		/* Allocate it now */
				res = change_bitmap(fs, scl, tcl, 1);	/* Mark the cluster block 'in use' */
				lclst = scl + tcl - 1;
			} else {		/* Set it as suggested point for next allocation */
				lclst = scl - 1;
			}
		}
	} else
#endif
	{
		scl = clst = stcl; ncl = 0;
		for (;;) {	/* Find a contiguous cluster block */
			n = get_fat(&fp->obj, clst);
			if (++clst >= fs->n_fatent) clst = 2;
			if (n == 1) { res = FR_INT_ERR; break; }
			if (n == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
			if (n == 0) {	/* Is it a free cluster? */
				if (++ncl == tcl) break;	/* Break if a contiguous cluster block is found */
			} else {
				scl = clst; ncl = 0;		/* Not a free cluster */
			}
			if (clst == stcl) { res = FR_DENIED; break; }	/* No contiguous cluster? */
		}
		if (res == FR_OK) {	/* A contiguous free area is found */
			if (opt) {		/* Allocate it now */
				for (clst = scl, n = tcl; n; clst++, n--) {	/* Create a cluster chain on the FAT */
					res = put_fat(fs, clst, (n == 1) ? 0xFFFFFFFF : clst + 1);
					if (res != FR_OK) break;
					lclst = clst;
				}
			} else {		/* Set it as suggested point for next allocation */
				lclst = scl - 1;
			}
		}
	}

	if (res == FR_OK) {
		fs->last_clst = lclst;		/* Set suggested start cluster to start next */
		if (opt) {	/* Is it allocated now? */
			fp->obj.sclust = scl;		/* Update object allocation information */
			fp->obj.objsize = fsz;
			if (_FS_EXFAT) fp->obj.stat = 2;	/* Set status 'contiguous chain' */
			fp->flag |= FA_MODIFIED;
			if (fs->free_clst <= fs->n_fatent - 2) {	/* Update FSINFO */
				fs->free_clst -= tcl;
				fs->fsi_flag |= 1;
			}
		}
	}

	LEAVE_FF(fs, res);
}

#endif /* _USE_EXPAND && !_FS_READONLY */


#if _USE_FORWARD
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Forward data to the stream directly                                   */
/*-----------------------------------------------------------------------*/

FRESULT f_forward (
	FIL* fp, 						/* Pointer to the file object */
	UINT (*func)(const BYTE*,UINT),	/* Pointer to the streaming function */
	UINT btf,						/* Number of bytes to forward */
	UINT* bf						/* Pointer to number of bytes forwarded */
)
{
	FRESULT res;
	FATFS *fs;
	DWORD clst, sect;
	FSIZE_t remain;
	UINT rcnt, csect;
	BYTE *dbuf;


	*bf = 0;	/* Clear transfer byte counter */
	res = validate(&fp->obj, &fs);		/* Check validity of the file object */
	if (res != FR_OK || (res = (FRESULT)fp->err) != FR_OK) LEAVE_FF(fs, res);
	if (!(fp->flag & FA_READ)) LEAVE_FF(fs, FR_DENIED);	/* Check access mode */

	remain = fp->obj.objsize - fp->fptr;
	if (btf > remain) btf = (UINT)remain;			/* Truncate btf by remaining bytes */

	for ( ;  btf && (*func)(0, 0);					/* Repeat until all data transferred or stream goes busy */
		fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
		csect = (UINT)(fp->fptr / SS(fs) & (fs->csize - 1));	/* Sector offset in the cluster */
		if (fp->fptr % SS(fs) == 0) {				/* On the sector boundary? */
			if (csect == 0) {						/* On the cluster boundary? */
				clst = (fp->fptr == 0) ?			/* On the top of the file? */
					fp->obj.sclust : get_fat(&fp->obj, fp->clust);
				if (clst <= 1) ABORT(fs, FR_INT_ERR);
				if (clst == 0xFFFFFFFF) ABORT(fs, FR_DISK_ERR);
				fp->clust = clst;					/* Update current cluster */
			}
		}
		sect = clust2sect(fs, fp->clust);			/* Get current data sector */
		if (!sect) ABORT(fs, FR_INT_ERR);
		sect += csect;
#if _FS_TINY
		if (move_window(fs, sect) != FR_OK) ABORT(fs, FR_DISK_ERR);	/* Move sector window to the file data */
		dbuf = fs->win;
#else
		if (fp->sect != sect) {		/* Fill sector cache with file data */
#if !_FS_READONLY
			if (fp->flag & FA_DIRTY) {		/* Write-back dirty sector cache */
				if (disk_write(fs->drv, fp->buf, fp->sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
				fp->flag &= (BYTE)~FA_DIRTY;
			}
#endif
			if (disk_read(fs->drv, fp->buf, sect, 1) != RES_OK) ABORT(fs, FR_DISK_ERR);
		}
		dbuf = fp->buf;
#endif
		fp->sect = sect;
		rcnt = SS(fs) - (UINT)fp->fptr % SS(fs);	/* Number of bytes left in the sector */
		if (rcnt > btf) rcnt = btf;					/* Clip it by btr if needed */
		rcnt = (*func)(dbuf + ((UINT)fp->fptr % SS(fs)), rcnt);	/* Forward the file data */
		if (!rcnt) ABORT(fs, FR_INT_ERR);
	}

	LEAVE_FF(fs, FR_OK);
}
#endif /* _USE_FORWARD */


#if _USE_MKFS && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create an FAT/exFAT volume                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_mkfs(
        const TCHAR *path,    /* Logical drive number */
        BYTE opt,            /* Format option */
        DWORD au,            /* Size of allocation unit (cluster) [byte] */
        void *work,            /* Pointer to working buffer */
        UINT len            /* Size of working buffer */
) {
    const UINT n_fats = 1;        /* Number of FATs for FAT12/16/32 volume (1 or 2) */
    const UINT n_rootdir = 512;    /* Number of root directory entries for FAT12/16 volume */
    static const WORD cst[] = {1, 4, 16, 64, 256, 512, 0};    /* Cluster size boundary for FAT12/16 volume (4Ks unit) */
    static const WORD cst32[] = {1, 2, 4, 8, 16, 32, 0};    /* Cluster size boundary for FAT32 volume (128Ks unit) */
    BYTE fmt, sys, *buf, *pte, pdrv, part;
    WORD ss;
    DWORD szb_buf, sz_buf, sz_blk, n_clst, pau, sect, nsect, n;
    DWORD b_vol, b_fat, b_data;                /* Base LBA for volume, fat, data */
    DWORD sz_vol, sz_rsv, sz_fat, sz_dir;    /* Size for volume, fat, dir, data */
    UINT i;
    int vol;
    DSTATUS stat;
#if _USE_TRIM || _FS_EXFAT
    DWORD tbl[3];
#endif


    /* Check mounted drive and clear work area */
    vol = get_ldnumber(&path);                    /* Get target logical drive */
    if (vol < 0) return FR_INVALID_DRIVE;
    if (FatFs[vol]) FatFs[vol]->fs_type = 0;    /* Clear the volume */
    pdrv = LD2PD(vol);    /* Physical drive */
    part = LD2PT(vol);    /* Partition (0:create as new, 1-4:get from partition table) */

    /* Check physical drive status */
    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
    if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &sz_blk) != RES_OK || !sz_blk || sz_blk > 32768 ||
        (sz_blk & (sz_blk - 1)))
        sz_blk = 1;    /* Erase block to align data area */
#if _MAX_SS != _MIN_SS        /* Get sector size of the medium if variable sector size cfg. */
                                                                                                                            if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &ss) != RES_OK) return FR_DISK_ERR;
	if (ss > _MAX_SS || ss < _MIN_SS || (ss & (ss - 1))) return FR_DISK_ERR;
#else
    ss = _MAX_SS;
#endif
    if ((au != 0 && au < ss) || au > 0x1000000 || (au & (au - 1)))
        return FR_INVALID_PARAMETER;    /* Check if au is valid */
    au /= ss;    /* Cluster size in unit of sector */

    /* Get working buffer */
    buf = (BYTE *) work;        /* Working buffer */
    sz_buf = len / ss;        /* Size of working buffer (sector) */
    szb_buf = sz_buf * ss;    /* Size of working buffer (byte) */
    if (!szb_buf) return FR_MKFS_ABORTED;

    /* Determine where the volume to be located (b_vol, sz_vol) */
    if (_MULTI_PARTITION && part != 0) {
        /* Get partition information from partition table in the MBR */
        if (disk_read(pdrv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;    /* Load MBR */
        if (ld_word(buf + BS_55AA) != 0xAA55) return FR_MKFS_ABORTED;    /* Check if MBR is valid */
        pte = buf + (MBR_Table + (part - 1) * SZ_PTE);
        if (!pte[PTE_System]) return FR_MKFS_ABORTED;    /* No partition? */
        b_vol = ld_dword(pte + PTE_StLba);        /* Get volume start sector */
        sz_vol = ld_dword(pte + PTE_SizLba);    /* Get volume size */
    } else {
        /* Create a single-partition in this function */
        if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_vol) != RES_OK) return FR_DISK_ERR;
        b_vol = (opt & FM_SFD) ? 0 : 63;        /* Volume start sector */
        if (sz_vol < b_vol) return FR_MKFS_ABORTED;
        sz_vol -= b_vol;                        /* Volume size */
    }
    if (sz_vol < 128) return FR_MKFS_ABORTED;    /* Check if volume size is >=128s */

    /* Pre-determine the FAT type */
    do {
        if (_FS_EXFAT && (opt & FM_EXFAT)) {    /* exFAT possible? */
            if ((opt & FM_ANY) == FM_EXFAT || sz_vol >= 0x4000000 ||
                au > 128) {    /* exFAT only, vol >= 64Ms or au > 128s ? */
                fmt = FS_EXFAT;
                break;
            }
        }
        if (au > 128) return FR_INVALID_PARAMETER;    /* Too large au for FAT/FAT32 */
        if (opt & FM_FAT32) {    /* FAT32 possible? */
            if ((opt & FM_ANY) == FM_FAT32 || !(opt & FM_FAT)) {    /* FAT32 only or no-FAT? */
                fmt = FS_FAT32;
                break;
            }
        }
        if (!(opt & FM_FAT)) return FR_INVALID_PARAMETER;    /* no-FAT? */
        fmt = FS_FAT16;
    } while (0);

#if _FS_EXFAT
    if (fmt == FS_EXFAT) {    /* Create an exFAT volume */
        DWORD szb_bit, szb_case, sum, nb, cl;
        WCHAR ch, si;
        UINT j, st;
        BYTE b;

        if (sz_vol < 0x1000) return FR_MKFS_ABORTED;    /* Too small volume? */
#if _USE_TRIM
                                                                                                                                tbl[0] = b_vol; tbl[1] = b_vol + sz_vol - 1;	/* Inform the device the volume area may be erased */
		disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
        /* Determine FAT location, data location and number of clusters */
        if (!au) {    /* au auto-selection */
            au = 8;
            if (sz_vol >= 0x80000) au = 64;        /* >= 512Ks */
            if (sz_vol >= 0x4000000) au = 256;    /* >= 64Ms */
        }
        b_fat = b_vol + 32;                                        /* FAT start at offset 32 */
        sz_fat = ((sz_vol / au + 2) * 4 + ss - 1) / ss;            /* Number of FAT sectors */
        b_data = (b_fat + sz_fat + sz_blk - 1) & ~(sz_blk - 1);    /* Align data area to the erase block boundary */
        if (b_data >= sz_vol / 2) return FR_MKFS_ABORTED;        /* Too small volume? */
        n_clst = (sz_vol - (b_data - b_vol)) / au;                /* Number of clusters */
        if (n_clst < 16) return FR_MKFS_ABORTED;                    /* Too few clusters? */
        if (n_clst > MAX_EXFAT) return FR_MKFS_ABORTED;            /* Too many clusters? */

        szb_bit = (n_clst + 7) / 8;                        /* Size of allocation bitmap */
        tbl[0] = (szb_bit + au * ss - 1) / (au * ss);    /* Number of allocation bitmap clusters */

        /* Create a compressed up-case table */
        sect = b_data + au * tbl[0];    /* Table start sector */
        sum = 0;                        /* Table checksum to be stored in the 82 entry */
        st = si = i = j = szb_case = 0;
        do {
            switch (st) {
                case 0:
                    ch = ff_wtoupper(si);    /* Get an up-case char */
                    if (ch != si) {
                        si++;
                        break;        /* Store the up-case char if exist */
                    }
                    for (j = 1; (WCHAR) (si + j) && (WCHAR) (si + j) == ff_wtoupper(
                            (WCHAR) (si + j)); j++);    /* Get run length of no-case block */
                    if (j >= 128) {
                        ch = 0xFFFF;
                        st = 2;
                        break;    /* Compress the no-case block if run is >= 128 */
                    }
                    st = 1;            /* Do not compress short run */
                    /* go to next case */
                case 1:
                    ch = si++;        /* Fill the short run */
                    if (--j == 0) st = 0;
                    break;

                default:
                    ch = (WCHAR) j;
                    si += j;    /* Number of chars to skip */
                    st = 0;
            }
            sum = xsum32(buf[i + 0] = (BYTE) ch, sum);        /* Put it into the write buffer */
            sum = xsum32(buf[i + 1] = (BYTE) (ch >> 8), sum);
            i += 2;
            szb_case += 2;
            if (!si || i == szb_buf) {        /* Write buffered data when buffer full or end of process */
                n = (i + ss - 1) / ss;
                if (disk_write(pdrv, buf, sect, n) != RES_OK) return FR_DISK_ERR;
                sect += n;
                i = 0;
            }
        } while (si);
        tbl[1] = (szb_case + au * ss - 1) / (au * ss);    /* Number of up-case table clusters */
        tbl[2] = 1;                                        /* Number of root dir clusters */

        /* Initialize the allocation bitmap */
        sect = b_data;
        nsect = (szb_bit + ss - 1) / ss;    /* Start of bitmap and number of sectors */
        nb = tbl[0] + tbl[1] + tbl[2];                    /* Number of clusters in-use by system */
        do {
            mem_set(buf, 0, szb_buf);
            for (i = 0; nb >= 8 && i < szb_buf; buf[i++] = 0xFF, nb -= 8);
            for (b = 1; nb && i < szb_buf; buf[i] |= b, b <<= 1, nb--);
            n = (nsect > sz_buf) ? sz_buf : nsect;        /* Write the buffered data */
            if (disk_write(pdrv, buf, sect, n) != RES_OK) return FR_DISK_ERR;
            sect += n;
            nsect -= n;
        } while (nsect);

        /* Initialize the FAT */
        sect = b_fat;
        nsect = sz_fat;    /* Start of FAT and number of FAT sectors */
        j = nb = cl = 0;
        do {
            mem_set(buf, 0, szb_buf);
            i = 0;    /* Clear work area and reset write index */
            if (cl == 0) {    /* Set entry 0 and 1 */
                st_dword(buf + i, 0xFFFFFFF8);
                i += 4;
                cl++;
                st_dword(buf + i, 0xFFFFFFFF);
                i += 4;
                cl++;
            }
            do {            /* Create chains of bitmap, up-case and root dir */
                while (nb && i < szb_buf) {            /* Create a chain */
                    st_dword(buf + i, (nb > 1) ? cl + 1 : 0xFFFFFFFF);
                    i += 4;
                    cl++;
                    nb--;
                }
                if (!nb && j < 3) nb = tbl[j++];    /* Next chain */
            } while (nb && i < szb_buf);
            n = (nsect > sz_buf) ? sz_buf : nsect;    /* Write the buffered data */
            if (disk_write(pdrv, buf, sect, n) != RES_OK) return FR_DISK_ERR;
            sect += n;
            nsect -= n;
        } while (nsect);

        /* Initialize the root directory */
        mem_set(buf, 0, szb_buf);
        buf[SZDIRE * 0 + 0] = 0x83;        /* 83 entry (volume label) */
        buf[SZDIRE * 1 + 0] = 0x81;        /* 81 entry (allocation bitmap) */
        st_dword(buf + SZDIRE * 1 + 20, 2);
        st_dword(buf + SZDIRE * 1 + 24, szb_bit);
        buf[SZDIRE * 2 + 0] = 0x82;        /* 82 entry (up-case table) */
        st_dword(buf + SZDIRE * 2 + 4, sum);
        st_dword(buf + SZDIRE * 2 + 20, 2 + tbl[0]);
        st_dword(buf + SZDIRE * 2 + 24, szb_case);
        sect = b_data + au * (tbl[0] + tbl[1]);
        nsect = au;    /* Start of the root directory and number of sectors */
        do {    /* Fill root directory sectors */
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if (disk_write(pdrv, buf, sect, n) != RES_OK) return FR_DISK_ERR;
            mem_set(buf, 0, ss);
            sect += n;
            nsect -= n;
        } while (nsect);

        /* Create two set of the exFAT VBR blocks */
        sect = b_vol;
        for (n = 0; n < 2; n++) {
            /* Main record (+0) */
            mem_set(buf, 0, ss);
            mem_cpy(buf + BS_JmpBoot, "\xEB\x76\x90" "EXFAT   ", 11);    /* Boot jump code (x86), OEM name */
            st_dword(buf + BPB_VolOfsEx, b_vol);                    /* Volume offset in the physical drive [sector] */
            st_dword(buf + BPB_TotSecEx, sz_vol);                    /* Volume size [sector] */
            st_dword(buf + BPB_FatOfsEx, b_fat - b_vol);            /* FAT offset [sector] */
            st_dword(buf + BPB_FatSzEx, sz_fat);                    /* FAT size [sector] */
            st_dword(buf + BPB_DataOfsEx, b_data - b_vol);            /* Data offset [sector] */
            st_dword(buf + BPB_NumClusEx, n_clst);                    /* Number of clusters */
            st_dword(buf + BPB_RootClusEx, 2 + tbl[0] + tbl[1]);    /* Root dir cluster # */
            st_dword(buf + BPB_VolIDEx, GET_FATTIME());                /* VSN */
            st_word(buf + BPB_FSVerEx, 0x100);                        /* File system version (1.00) */
            for (buf[BPB_BytsPerSecEx] = 0, i = ss; i >>= 1; buf[BPB_BytsPerSecEx]++);    /* Log2 of sector size [byte] */
            for (buf[BPB_SecPerClusEx] = 0, i = au; i >>= 1; buf[BPB_SecPerClusEx]++);    /* Log2 of cluster size [sector] */
            buf[BPB_NumFATsEx] = 1;                    /* Number of FATs */
            buf[BPB_DrvNumEx] = 0x80;                /* Drive number (for int13) */
            st_word(buf + BS_BootCodeEx, 0xFEEB);    /* Boot code (x86) */
            st_word(buf + BS_55AA, 0xAA55);            /* Signature (placed here regardless of sector size) */
            for (i = sum = 0; i < ss; i++) {        /* VBR checksum */
                if (i != BPB_VolFlagEx && i != BPB_VolFlagEx + 1 && i != BPB_PercInUseEx) sum = xsum32(buf[i], sum);
            }
            if (disk_write(pdrv, buf, sect++, 1) != RES_OK) return FR_DISK_ERR;
            /* Extended bootstrap record (+1..+8) */
            mem_set(buf, 0, ss);
            st_word(buf + ss - 2, 0xAA55);    /* Signature (placed at end of sector) */
            for (j = 1; j < 9; j++) {
                for (i = 0; i < ss; sum = xsum32(buf[i++], sum));    /* VBR checksum */
                if (disk_write(pdrv, buf, sect++, 1) != RES_OK) return FR_DISK_ERR;
            }
            /* OEM/Reserved record (+9..+10) */
            mem_set(buf, 0, ss);
            for (; j < 11; j++) {
                for (i = 0; i < ss; sum = xsum32(buf[i++], sum));    /* VBR checksum */
                if (disk_write(pdrv, buf, sect++, 1) != RES_OK) return FR_DISK_ERR;
            }
            /* Sum record (+11) */
            for (i = 0; i < ss; i += 4) st_dword(buf + i, sum);        /* Fill with checksum value */
            if (disk_write(pdrv, buf, sect++, 1) != RES_OK) return FR_DISK_ERR;
        }

    } else
#endif    /* _FS_EXFAT */
    {    /* Create an FAT12/16/32 volume */
        do {
            pau = au;
            /* Pre-determine number of clusters and FAT sub-type */
            if (fmt == FS_FAT32) {    /* FAT32 volume */
                if (!pau) {    /* au auto-selection */
                    n = sz_vol / 0x20000;    /* Volume size in unit of 128KS */
                    for (i = 0, pau = 1; cst32[i] && cst32[i] <= n; i++, pau <<= 1);    /* Get from table */
                }
                n_clst = sz_vol / pau;    /* Number of clusters */
                sz_fat = (n_clst * 4 + 8 + ss - 1) / ss;    /* FAT size [sector] */
                sz_rsv = 32;    /* Number of reserved sectors */
                sz_dir = 0;        /* No static directory */
                if (n_clst <= MAX_FAT16 || n_clst > MAX_FAT32) return FR_MKFS_ABORTED;
            } else {                /* FAT12/16 volume */
                if (!pau) {    /* au auto-selection */
                    n = sz_vol / 0x1000;    /* Volume size in unit of 4KS */
                    for (i = 0, pau = 1; cst[i] && cst[i] <= n; i++, pau <<= 1);    /* Get from table */
                }
                n_clst = sz_vol / pau;
                if (n_clst > MAX_FAT12) {
                    n = n_clst * 2 + 4;        /* FAT size [byte] */
                } else {
                    fmt = FS_FAT12;
                    n = (n_clst * 3 + 1) / 2 + 3;    /* FAT size [byte] */
                }
                sz_fat = (n + ss - 1) / ss;        /* FAT size [sector] */
                sz_rsv = 1;                        /* Number of reserved sectors */
                sz_dir = (DWORD) n_rootdir * SZDIRE / ss;    /* Rootdir size [sector] */
            }
            b_fat = b_vol + sz_rsv;                        /* FAT base */
            b_data = b_fat + sz_fat * n_fats + sz_dir;    /* Data base */

            /* Align data base to erase block boundary (for flash memory media) */
            n = ((b_data + sz_blk - 1) & ~(sz_blk - 1)) -
                b_data;    /* Next nearest erase block from current data base */
            if (fmt == FS_FAT32) {        /* FAT32: Move FAT base */
                sz_rsv += n;
                b_fat += n;
            } else {                    /* FAT12/16: Expand FAT size */
                sz_fat += n / n_fats;
            }

            /* Determine number of clusters and final check of validity of the FAT sub-type */
            if (sz_vol < b_data + pau * 16 - b_vol) return FR_MKFS_ABORTED;    /* Too small volume */
            n_clst = (sz_vol - sz_rsv - sz_fat * n_fats - sz_dir) / pau;
            if (fmt == FS_FAT32) {
                if (n_clst <= MAX_FAT16) {    /* Too few clusters for FAT32 */
                    if (!au && (au = pau / 2) != 0) continue;    /* Adjust cluster size and retry */
                    return FR_MKFS_ABORTED;
                }
            }
            if (fmt == FS_FAT16) {
                if (n_clst > MAX_FAT16) {    /* Too many clusters for FAT16 */
                    if (!au && (pau * 2) <= 64) {
                        au = pau * 2;
                        continue;        /* Adjust cluster size and retry */
                    }
                    if ((opt & FM_FAT32)) {
                        fmt = FS_FAT32;
                        continue;    /* Switch type to FAT32 and retry */
                    }
                    if (!au && (au = pau * 2) <= 128) continue;    /* Adjust cluster size and retry */
                    return FR_MKFS_ABORTED;
                }
                if (n_clst <= MAX_FAT12) {    /* Too few clusters for FAT16 */
                    if (!au && (au = pau * 2) <= 128) continue;    /* Adjust cluster size and retry */
                    return FR_MKFS_ABORTED;
                }
            }
            if (fmt == FS_FAT12 && n_clst > MAX_FAT12) return FR_MKFS_ABORTED;    /* Too many clusters for FAT12 */

            /* Ok, it is the valid cluster configuration */
            break;
        } while (1);

#if _USE_TRIM
                                                                                                                                tbl[0] = b_vol; tbl[1] = b_vol + sz_vol - 1;	/* Inform the device the volume area can be erased */
		disk_ioctl(pdrv, CTRL_TRIM, tbl);
#endif
        /* Create FAT VBR */
        mem_set(buf, 0, ss);
        mem_cpy(buf + BS_JmpBoot, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code (x86), OEM name */
        st_word(buf + BPB_BytsPerSec, ss);                /* Sector size [byte] */
        buf[BPB_SecPerClus] = (BYTE) pau;                /* Cluster size [sector] */
        st_word(buf + BPB_RsvdSecCnt, (WORD) sz_rsv);    /* Size of reserved area */
        buf[BPB_NumFATs] = (BYTE) n_fats;                /* Number of FATs */
        st_word(buf + BPB_RootEntCnt,
                (WORD) ((fmt == FS_FAT32) ? 0 : n_rootdir));    /* Number of root directory entries */
        if (sz_vol < 0x10000) {
            st_word(buf + BPB_TotSec16, (WORD) sz_vol);    /* Volume size in 16-bit LBA */
        } else {
            st_dword(buf + BPB_TotSec32, sz_vol);        /* Volume size in 32-bit LBA */
        }
        buf[BPB_Media] = 0xF8;                            /* Media descriptor byte */
        st_word(buf + BPB_SecPerTrk, 63);                /* Number of sectors per track (for int13) */
        st_word(buf + BPB_NumHeads, 255);                /* Number of heads (for int13) */
        st_dword(buf + BPB_HiddSec, b_vol);                /* Volume offset in the physical drive [sector] */
        if (fmt == FS_FAT32) {
            st_dword(buf + BS_VolID32, GET_FATTIME());    /* VSN */
            st_dword(buf + BPB_FATSz32, sz_fat);        /* FAT size [sector] */
            st_dword(buf + BPB_RootClus32, 2);            /* Root directory cluster # (2) */
            st_word(buf + BPB_FSInfo32, 1);                /* Offset of FSINFO sector (VBR + 1) */
            st_word(buf + BPB_BkBootSec32, 6);            /* Offset of backup VBR (VBR + 6) */
            buf[BS_DrvNum32] = 0x80;                    /* Drive number (for int13) */
            buf[BS_BootSig32] = 0x29;                    /* Extended boot signature */
            mem_cpy(buf + BS_VolLab32, "NO NAME    " "FAT32   ", 19);    /* Volume label, FAT signature */
        } else {
            st_dword(buf + BS_VolID, GET_FATTIME());    /* VSN */
            st_word(buf + BPB_FATSz16, (WORD) sz_fat);    /* FAT size [sector] */
            buf[BS_DrvNum] = 0x80;                        /* Drive number (for int13) */
            buf[BS_BootSig] = 0x29;                        /* Extended boot signature */
            mem_cpy(buf + BS_VolLab, "NO NAME    " "FAT     ", 19);    /* Volume label, FAT signature */
        }
        st_word(buf + BS_55AA,
                0xAA55);                    /* Signature (offset is fixed here regardless of sector size) */
        if (disk_write(pdrv, buf, b_vol, 1) != RES_OK) return FR_DISK_ERR;    /* Write it to the VBR sector */

        /* Create FSINFO record if needed */
        if (fmt == FS_FAT32) {
            disk_write(pdrv, buf, b_vol + 6, 1);        /* Write backup VBR (VBR + 6) */
            mem_set(buf, 0, ss);
            st_dword(buf + FSI_LeadSig, 0x41615252);
            st_dword(buf + FSI_StrucSig, 0x61417272);
            st_dword(buf + FSI_Free_Count, n_clst - 1);    /* Number of free clusters */
            st_dword(buf + FSI_Nxt_Free, 2);            /* Last allocated cluster# */
            st_word(buf + BS_55AA, 0xAA55);
            disk_write(pdrv, buf, b_vol + 7, 1);        /* Write backup FSINFO (VBR + 7) */
            disk_write(pdrv, buf, b_vol + 1, 1);        /* Write original FSINFO (VBR + 1) */
        }

        /* Initialize FAT area */
        mem_set(buf, 0, (UINT) szb_buf);
        sect = b_fat;        /* FAT start sector */
        for (i = 0; i < n_fats; i++) {            /* Initialize FATs each */
            if (fmt == FS_FAT32) {
                st_dword(buf + 0, 0xFFFFFFF8);    /* Entry 0 */
                st_dword(buf + 4, 0xFFFFFFFF);    /* Entry 1 */
                st_dword(buf + 8, 0x0FFFFFFF);    /* Entry 2 (root directory) */
            } else {
                st_dword(buf + 0, (fmt == FS_FAT12) ? 0xFFFFF8 : 0xFFFFFFF8);    /* Entry 0 and 1 */
            }
            nsect = sz_fat;        /* Number of FAT sectors */
            do {    /* Fill FAT sectors */
                n = (nsect > sz_buf) ? sz_buf : nsect;
                if (disk_write(pdrv, buf, sect, (UINT) n) != RES_OK) return FR_DISK_ERR;
                mem_set(buf, 0, ss);
                sect += n;
                nsect -= n;
            } while (nsect);
        }

        /* Initialize root directory (fill with zero) */
        nsect = (fmt == FS_FAT32) ? pau : sz_dir;    /* Number of root directory sectors */
        do {
            n = (nsect > sz_buf) ? sz_buf : nsect;
            if (disk_write(pdrv, buf, sect, (UINT) n) != RES_OK) return FR_DISK_ERR;
            sect += n;
            nsect -= n;
        } while (nsect);
    }

    /* Determine system ID in the partition table */
    if (_FS_EXFAT && fmt == FS_EXFAT) {
        sys = 0x07;            /* HPFS/NTFS/exFAT */
    } else {
        if (fmt == FS_FAT32) {
            sys = 0x0C;        /* FAT32X */
        } else {
            if (sz_vol >= 0x10000) {
                sys = 0x06;    /* FAT12/16 (>=64KS) */
            } else {
                sys = (fmt == FS_FAT16) ? 0x04 : 0x01;    /* FAT16 (<64KS) : FAT12 (<64KS) */
            }
        }
    }

    /* Update partition information */
    if (_MULTI_PARTITION && part != 0) {    /* Created in the existing partition */
        /* Update system ID in the partition table */
        if (disk_read(pdrv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;    /* Read the MBR */
        buf[MBR_Table + (part - 1) * SZ_PTE + PTE_System] = sys;        /* Set system ID */
        if (disk_write(pdrv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;    /* Write it back to the MBR */
    } else {                                /* Created as a new single partition */
        if (!(opt & FM_SFD)) {    /* Create partition table if in FDISK format */
            mem_set(buf, 0, ss);
            st_word(buf + BS_55AA, 0xAA55);        /* MBR signature */
            pte = buf + MBR_Table;                /* Create partition table for single partition in the drive */
            pte[PTE_Boot] = 0;                    /* Boot indicator */
            pte[PTE_StHead] = 1;                /* Start head */
            pte[PTE_StSec] = 1;                    /* Start sector */
            pte[PTE_StCyl] = 0;                    /* Start cylinder */
            pte[PTE_System] = sys;                /* System type */
            n = (b_vol + sz_vol) / (63 * 255);    /* (End CHS may be invalid) */
            pte[PTE_EdHead] = 254;                /* End head */
            pte[PTE_EdSec] = (BYTE) (n >> 2 | 63);    /* End sector */
            pte[PTE_EdCyl] = (BYTE) n;            /* End cylinder */
            st_dword(pte + PTE_StLba, b_vol);    /* Start offset in LBA */
            st_dword(pte + PTE_SizLba, sz_vol);    /* Size in sectors */
            if (disk_write(pdrv, buf, 0, 1) != RES_OK) return FR_DISK_ERR;    /* Write it to the MBR */
        }
    }

    if (disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) return FR_DISK_ERR;

    return FR_OK;
}


#if _MULTI_PARTITION
                                                                                                                        /*-----------------------------------------------------------------------*/
/* Create partition table on the physical drive                          */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk (
	BYTE pdrv,			/* Physical drive number */
	const DWORD* szt,	/* Pointer to the size table for each partitions */
	void* work			/* Pointer to the working buffer */
)
{
	UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
	BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
	DSTATUS stat;
	DWORD sz_disk, sz_part, s_part;


	stat = disk_initialize(pdrv);
	if (stat & STA_NOINIT) return FR_NOT_READY;
	if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
	if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;

	/* Determine the CHS without any consideration of the drive geometry */
	for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
	if (n == 256) n--;
	e_hd = n - 1;
	sz_cyl = 63 * n;
	tot_cyl = sz_disk / sz_cyl;

	/* Create partition table */
	mem_set(buf, 0, _MAX_SS);
	p = buf + MBR_Table; b_cyl = 0;
	for (i = 0; i < 4; i++, p += SZ_PTE) {
		p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;	/* Number of cylinders */
		if (!p_cyl) continue;
		s_part = (DWORD)sz_cyl * b_cyl;
		sz_part = (DWORD)sz_cyl * p_cyl;
		if (i == 0) {	/* Exclude first track of cylinder 0 */
			s_hd = 1;
			s_part += 63; sz_part -= 63;
		} else {
			s_hd = 0;
		}
		e_cyl = b_cyl + p_cyl - 1;	/* End cylinder */
		if (e_cyl >= tot_cyl) return FR_INVALID_PARAMETER;

		/* Set partition table */
		p[1] = s_hd;						/* Start head */
		p[2] = (BYTE)((b_cyl >> 2) + 1);	/* Start sector */
		p[3] = (BYTE)b_cyl;					/* Start cylinder */
		p[4] = 0x07;						/* System type (temporary setting) */
		p[5] = e_hd;						/* End head */
		p[6] = (BYTE)((e_cyl >> 2) + 63);	/* End sector */
		p[7] = (BYTE)e_cyl;					/* End cylinder */
		st_dword(p + 8, s_part);			/* Start sector in LBA */
		st_dword(p + 12, sz_part);			/* Number of sectors */

		/* Next partition */
		b_cyl += p_cyl;
	}
	st_word(p, 0xAA55);

	/* Write it to the MBR */
	return (disk_write(pdrv, buf, 0, 1) != RES_OK || disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) ? FR_DISK_ERR : FR_OK;
}

#endif /* _MULTI_PARTITION */
#endif /* _USE_MKFS && !_FS_READONLY */


#if _USE_STRFUNC
/*-----------------------------------------------------------------------*/
/* Get a string from the file                                            */
/*-----------------------------------------------------------------------*/

TCHAR *f_gets(
        TCHAR *buff,    /* Pointer to the string buffer to read */
        int len,        /* Size of string buffer (characters) */
        FIL *fp            /* Pointer to the file object */
) {
    int n = 0;
    TCHAR c, *p = buff;
    BYTE s[2];
    UINT rc;


    while (n < len - 1) {    /* Read characters until buffer gets filled */
#if _LFN_UNICODE
                                                                                                                                #if _STRF_ENCODE == 3		/* Read a character in UTF-8 */
		f_read(fp, s, 1, &rc);
		if (rc != 1) break;
		c = s[0];
		if (c >= 0x80) {
			if (c < 0xC0) continue;	/* Skip stray trailer */
			if (c < 0xE0) {			/* Two-byte sequence (0x80-0x7FF) */
				f_read(fp, s, 1, &rc);
				if (rc != 1) break;
				c = (c & 0x1F) << 6 | (s[0] & 0x3F);
				if (c < 0x80) c = '?';	/* Reject invalid code range */
			} else {
				if (c < 0xF0) {		/* Three-byte sequence (0x800-0xFFFF) */
					f_read(fp, s, 2, &rc);
					if (rc != 2) break;
					c = c << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);
					if (c < 0x800) c = '?';	/* Reject invalid code range */
				} else {			/* Reject four-byte sequence */
					c = '?';
				}
			}
		}
#elif _STRF_ENCODE == 2		/* Read a character in UTF-16BE */
		f_read(fp, s, 2, &rc);
		if (rc != 2) break;
		c = s[1] + (s[0] << 8);
#elif _STRF_ENCODE == 1		/* Read a character in UTF-16LE */
		f_read(fp, s, 2, &rc);
		if (rc != 2) break;
		c = s[0] + (s[1] << 8);
#else						/* Read a character in ANSI/OEM */
		f_read(fp, s, 1, &rc);
		if (rc != 1) break;
		c = s[0];
		if (IsDBCS1(c)) {
			f_read(fp, s, 1, &rc);
			if (rc != 1) break;
			c = (c << 8) + s[0];
		}
		c = ff_convert(c, 1);	/* OEM -> Unicode */
		if (!c) c = '?';
#endif
#else						/* Read a character without conversion */
        f_read(fp, s, 1, &rc);
        if (rc != 1) break;
        c = s[0];
#endif
        if (_USE_STRFUNC == 2 && c == '\r') continue;    /* Strip '\r' */
        *p++ = c;
        n++;
        if (c == '\n') break;        /* Break on EOL */
    }
    *p = 0;
    return n ? buff : 0;            /* When no data read (eof or error), return with error. */
}


#if !_FS_READONLY

#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a character to the file                                           */
/*-----------------------------------------------------------------------*/

typedef struct {
    FIL *fp;        /* Ptr to the writing file */
    int idx, nchr;    /* Write index of buf[] (-1:error), number of chars written */
    BYTE buf[64];    /* Write buffer */
} putbuff;


static
void putc_bfd(        /* Buffered write with code conversion */
        putbuff *pb,
        TCHAR c
) {
    UINT bw;
    int i;


    if (_USE_STRFUNC == 2 && c == '\n') {     /* LF -> CRLF conversion */
        putc_bfd(pb, '\r');
    }

    i = pb->idx;        /* Write index of pb->buf[] */
    if (i < 0) return;

#if _LFN_UNICODE
                                                                                                                            #if _STRF_ENCODE == 3			/* Write a character in UTF-8 */
	if (c < 0x80) {				/* 7-bit */
		pb->buf[i++] = (BYTE)c;
	} else {
		if (c < 0x800) {		/* 11-bit */
			pb->buf[i++] = (BYTE)(0xC0 | c >> 6);
		} else {				/* 16-bit */
			pb->buf[i++] = (BYTE)(0xE0 | c >> 12);
			pb->buf[i++] = (BYTE)(0x80 | (c >> 6 & 0x3F));
		}
		pb->buf[i++] = (BYTE)(0x80 | (c & 0x3F));
	}
#elif _STRF_ENCODE == 2			/* Write a character in UTF-16BE */
	pb->buf[i++] = (BYTE)(c >> 8);
	pb->buf[i++] = (BYTE)c;
#elif _STRF_ENCODE == 1			/* Write a character in UTF-16LE */
	pb->buf[i++] = (BYTE)c;
	pb->buf[i++] = (BYTE)(c >> 8);
#else							/* Write a character in ANSI/OEM */
	c = ff_convert(c, 0);	/* Unicode -> OEM */
	if (!c) c = '?';
	if (c >= 0x100)
		pb->buf[i++] = (BYTE)(c >> 8);
	pb->buf[i++] = (BYTE)c;
#endif
#else							/* Write a character without conversion */
    pb->buf[i++] = (BYTE) c;
#endif

    if (i >= (int) (sizeof pb->buf) - 3) {    /* Write buffered characters to the file */
        f_write(pb->fp, pb->buf, (UINT) i, &bw);
        i = (bw == (UINT) i) ? 0 : -1;
    }
    pb->idx = i;
    pb->nchr++;
}


static
int putc_flush(        /* Flush left characters in the buffer */
        putbuff *pb
) {
    UINT nw;

    if (pb->idx >= 0    /* Flush buffered characters to the file */
        && f_write(pb->fp, pb->buf, (UINT) pb->idx, &nw) == FR_OK
        && (UINT) pb->idx == nw)
        return pb->nchr;
    return EOF;
}


static
void putc_init(        /* Initialize write buffer */
        putbuff *pb,
        FIL *fp
) {
    pb->fp = fp;
    pb->nchr = pb->idx = 0;
}


int f_putc(
        TCHAR c,    /* A character to be output */
        FIL *fp        /* Pointer to the file object */
) {
    putbuff pb;


    putc_init(&pb, fp);
    putc_bfd(&pb, c);    /* Put the character */
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/

int f_puts(
        const TCHAR *str,    /* Pointer to the string to be output */
        FIL *fp                /* Pointer to the file object */
) {
    putbuff pb;


    putc_init(&pb, fp);
    while (*str) putc_bfd(&pb, *str++);        /* Put the string */
    return putc_flush(&pb);
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/

int f_printf(
        FIL *fp,            /* Pointer to the file object */
        const TCHAR *fmt,    /* Pointer to the format string */
        ...                    /* Optional arguments... */
) {
    va_list arp;
    putbuff pb;
    BYTE f, r;
    UINT i, j, w;
    DWORD v;
    TCHAR c, d, str[32], *p;


    putc_init(&pb, fp);

    va_start(arp, fmt);

    for (;;) {
        c = *fmt++;
        if (c == 0) break;            /* End of string */
        if (c != '%') {                /* Non escape character */
            putc_bfd(&pb, c);
            continue;
        }
        w = f = 0;
        c = *fmt++;
        if (c == '0') {                /* Flag: '0' padding */
            f = 1;
            c = *fmt++;
        } else {
            if (c == '-') {            /* Flag: left justified */
                f = 2;
                c = *fmt++;
            }
        }
        while (IsDigit(c)) {        /* Precision */
            w = w * 10 + c - '0';
            c = *fmt++;
        }
        if (c == 'l' || c == 'L') {    /* Prefix: Size is long int */
            f |= 4;
            c = *fmt++;
        }
        if (!c) break;
        d = c;
        if (IsLower(d)) d -= 0x20;
        switch (d) {                /* Type is... */
            case 'S' :                    /* String */
                p = va_arg(arp, TCHAR*);
                for (j = 0; p[j]; j++);
                if (!(f & 2)) {
                    while (j++ < w) putc_bfd(&pb, ' ');
                }
                while (*p) putc_bfd(&pb, *p++);
                while (j++ < w) putc_bfd(&pb, ' ');
                continue;

            case 'C' :                    /* Character */
                putc_bfd(&pb, (TCHAR) va_arg(arp, int));
                continue;

            case 'B' :                    /* Binary */
                r = 2;
                break;

            case 'O' :                    /* Octal */
                r = 8;
                break;

            case 'D' :                    /* Signed decimal */
            case 'U' :                    /* Unsigned decimal */
                r = 10;
                break;

            case 'X' :                    /* Hexdecimal */
                r = 16;
                break;

            default:                    /* Unknown type (pass-through) */
                putc_bfd(&pb, c);
                continue;
        }

        /* Get an argument and put it in numeral */
        v = (f & 4) ? (DWORD) va_arg(arp, long) : ((d == 'D') ? (DWORD) (long) va_arg(arp, int) : (DWORD) va_arg(arp,
                                                                                                                 unsigned int));
        if (d == 'D' && (v & 0x80000000)) {
            v = 0 - v;
            f |= 8;
        }
        i = 0;
        do {
            d = (TCHAR) (v % r);
            v /= r;
            if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
            str[i++] = d + '0';
        } while (v && i < sizeof str / sizeof str[0]);
        if (f & 8) str[i++] = '-';
        j = i;
        d = (f & 1) ? '0' : ' ';
        while (!(f & 2) && j++ < w) putc_bfd(&pb, d);
        do {
            putc_bfd(&pb, str[--i]);
        } while (i);
        while (j++ < w) putc_bfd(&pb, d);
    }

    va_end(arp);

    return putc_flush(&pb);
}

#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */
